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Jacobsite

A valid IMA mineral species - grandfathered

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Photos of Jacobsite (73)Discuss Jacobsite

Jacobsite Gallery Search Photos of Jacobsite

Edit Jacobsite Add Synonym Edit CIF structures Clear Cache

Jacobsite

Pumice quarries, Wingertsberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Jacobsite, etc.

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

Jacobsite

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden

Jacobsite

Pumice quarries, Wingertsberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Jacobsite, etc.

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

Jacobsite

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden

Jacobsite

Pumice quarries, Wingertsberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Jacobsite, etc.

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

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About JacobsiteHide

View on the dump

Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden

Formula:

Mn²⁺Fe³⁺₂O₄

Colour:

Black, gray in reflected light

Lustre:

Resinous, Sub-Metallic

Hardness:

5½ - 6½

Specific Gravity:

4.76

Crystal System:

Isometric

Member of:

Spinel Subgroup > Oxyspinel Group > Spinel Supergroup

Name:

Named in 1869 by Augustin Alexis Damour for the type locality of Jakobsberg, Sweden.

Type Locality:

ⓘ Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden

Dimorph of:

'Jacobsite-Q'

Isostructural with:

Franklinite, Galaxite, Magnetite

Jacobsite-Magnetite Series.
Ferromagnetic. Often occurs in octahedral crystals.

Jacobsite-Q is a polymorph of jacobsite.

May be exomorphically exsolved from bixbyite (Peter et al., 2021).

Visit gemdat.org for gemological information about Jacobsite.

Unique IdentifiersHide

Mindat ID:

2061

Long-form identifier:

mindat:1:1:2061:5

Similar NamesHide

Jacobsite-Q

Mn²⁺(Fe³⁺,Mn³⁺)₂O₄

IMA Classification of JacobsiteHide

IMA status:

Approved, 'Grandfathered' (first described prior to 1959)

First published:

1869

Type description reference:

Damour, A.A. (1869) Notice sur la jakobsite, nouvelle espèce minérale. Comptes Rendus Hebdomadaires des Séances de l’Académie des Sciences: 69: 168-172.

Classification of JacobsiteHide

Strunz-mindat (2026):

4.BB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations

Dana 8th ed.:

7.2.2.2

7 : MULTIPLE OXIDES
2 : AB₂X₄

Hey's CIM Ref.:

7.19.3

7 : Oxides and Hydroxides
19 : Oxides of Mn and Fe

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference for Standard
Jcb	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of JacobsiteHide

Lustre:

Resinous, Sub-Metallic

Transparency:

Opaque

Colour:

Black, gray in reflected light

Streak:

Reddish black

Hardness:

5½ - 6½ on Mohs scale

Tenacity:

Brittle

Fracture:

Irregular/Uneven, Sub-Conchoidal

Density:

4.76 g/cm³ (Measured) 5.03 g/cm³ (Calculated)

Optical Data of JacobsiteHide

Type:

Isotropic

Colour in reflected light:

Gray-white with olive tint

Internal Reflections:

Brown

Pleochroism:

Non-pleochroic

Chemistry of JacobsiteHide

Mindat Formula:

Mn²⁺Fe³⁺₂O₄

Element Weights:

Element	% weight
Fe	48.429 %
O	27.750 %
Mn	23.821 %

Calculated from ideal end-member formula.

Elements listed:

Fe, Mn, O - search for minerals with similar chemistry

Common Impurities:

Crystallography of JacobsiteHide

Crystal System:

Isometric

Class (H-M):

m3m(4/m32/m) - Hexoctahedral

Space Group:

Fd3m

Cell Parameters:

a = 8.457 Å

Unit Cell V:

604.85 Å³ (Calculated from Unit Cell)

Morphology:

Octahedral. Rarely found as crystals. Massive, granular.

Crystallographic forms of JacobsiteHide

Crystal Atlas:

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Jacobsite no.1 - {111} - Goldschmidt (1913-1926)

Jacobsite no.6 - {111} - Goldschmidt (1913-1926)

3d models and HTML5 code kindly provided by www.smorf.nl.

Crystal StructureHide

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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0017296	Jacobsite	Montoro V (1938) Miscibilita fra gli ossidi salini di ferro e di manganese _cod_database_code 1010370 Gazzetta Chimica Italiana 68 728-733		1938		0	293
0017061	Jacobsite	Passerini L (1930) Ricerche sugli Spinelli.- II. I Composti. Cu Al2 O4, Mg Al2 O4, Mg Fe2 O4, Zn Al2 O4, Zn Cr2 O4, Zn Fe2 O4, Mn Fe2 O4 _cod_database_code 1010131 Gazzetta Chimica Italiana 60 389-399		1930		0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Jacobsite'
loop_
_publ_author_name
'Montoro V'
_journal_name_full 'Gazzetta Chimica Italiana'
_journal_volume 68 
_journal_year 1938
_journal_page_first 728
_journal_page_last 733
_publ_section_title
;
 Miscibilita fra gli ossidi salini di ferro e di manganese
 _cod_database_code 1010370
;
_database_code_amcsd 0017296
_chemical_formula_sum 'Fe1.5 Mn1.5 O4'
_cell_length_a 8.501
_cell_length_b 8.501
_cell_length_c 8.501
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 614.342
_exptl_crystal_density_diffrn      4.977
_symmetry_space_group_name_H-M 'F d 3 m'
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loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Fe1   0.62500   0.62500   0.62500   0.25000
Fe2   0.62500   0.62500   0.62500   0.25000
Fe3   0.00000   0.00000   0.00000   0.50000
Mn1   0.62500   0.62500   0.62500   0.25000
Mn2   0.62500   0.62500   0.62500   0.25000
Mn3   0.00000   0.00000   0.00000   0.50000
O1   0.37500   0.37500   0.37500   1.00000

Epitaxial Relationships of JacobsiteHide

Epitaxial Minerals:

'Hausmannite'

Mn²⁺Mn³⁺₂O₄

Epitaxy Comments:

Oriented intergrowths (Vredenbergite).

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
4.906 Å	(20)
3.005 Å	(35)
2.563 Å	(100)
2.450 Å	(12)
2.124 Å	(25)
1.7342 Å	(20)
1.6355 Å	(35)
1.5031 Å	(40)
1.4376 Å	(4)
1.3441 Å	(4)
1.2962 Å	(20)
1.2810 Å	(15)
1.2276 Å	(10)
1.1898 Å	(12)
1.1355 Å	(7)
1.1063 Å	(30)
1.0623 Å	(14)
0.9815 Å	(20)

Comments:

ICDD 10-319 (synthetic)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Near-surface Processes
21 : Chemically precipitated carbonate, phosphate, iron formations
High-? alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits
Stage 5: Initiation of plate tectonics	<3.5-2.5
40 : Regional metamorphism (greenschist, amphibolite, granulite facies)

Type Occurrence of JacobsiteHide

Type Locality:

ⓘ Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden

Place of Conservation of Type Material:

Swedish Museum of Natural History, Stockholm, Sweden.

Reference:

Damour, A.A. (1869) Notice sur la jakobsite, nouvelle espèce minérale. Comptes Rendus Hebdomadaires des Séances de l’Académie des Sciences: 69: 168-172.

Other Language Names for JacobsiteHide

Dutch:Jacobsiet

German:Jakobsit
Jacobsit

Russian:Якобсит

Simplified Chinese:黑镁铁锰矿
锰铁矿

Spanish:Jacobsita

Relationship of Jacobsite to other SpeciesHide

Member of:

Spinel Subgroup > Oxyspinel Group > Spinel Supergroup

Other Members of Spinel Subgroup:

Chihmingite	NiAl₂O₄	Iso. m3m(4/m32/m) : Fd3m
Chromite	Fe²⁺Cr³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
Cochromite	CoCr₂O₄	Iso. m3m(4/m32/m) : Fd3m
Coulsonite	Fe²⁺V³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
Cuprospinel	Cu²⁺Fe³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
Dellagiustaite	V²⁺Al₂O₄	Iso. m3m(4/m32/m) : Fd3m
Deltalumite	(Al_0.67◻_0.33)Al₂O₄	Tet. 42m : P4m2
Franklinite	Zn²⁺Fe³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
Gahnite	ZnAl₂O₄	Iso. m3m(4/m32/m) : Fd3m
Galaxite	Mn²⁺Al₂O₄	Iso. m3m(4/m32/m) : Fd3m
Guite	Co²⁺Co³⁺₂O₄	Iso.
Hausmannite	Mn²⁺Mn³⁺₂O₄	Tet. 4/mmm(4/m2/m2/m) : I4₁/amd
Hercynite	Fe²⁺Al₂O₄	Iso. m3m(4/m32/m) : Fd3m
Hetaerolite	ZnMn₂O₄	Tet. 4/mmm(4/m2/m2/m) : I4₁/amd
'Jacobsite-Q'	Mn²⁺(Fe³⁺,Mn³⁺)₂O₄	Tet. 4/mmm(4/m2/m2/m) : I4₁/amd
Maghemite	(Fe³⁺_0.67◻_0.33)Fe³⁺₂O₄	Iso. 432 : P4₁32
Magnesiochromite	MgCr₂O₄	Iso. m3m(4/m32/m) : Fd3m
Magnesiocoulsonite	MgV₂O₄	Iso. m3m(4/m32/m)
Magnesioferrite	MgFe³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
Magnetite	Fe²⁺Fe³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
Manganochromite	Mn²⁺Cr₂O₄	Iso. m3m(4/m32/m) : Fd3m
'Nichromite'	(Ni,Co,Fe)(Cr,Fe,Al)₂O₄	Iso. m3m(4/m32/m) : Fd3m
Spinel	MgAl₂O₄	Iso. m3m(4/m32/m) : Fd3m
Thermaerogenite	CuAl₂O₄	Iso. m3m(4/m32/m) : Fd3m
Titanomaghemite	(Ti⁴⁺_0.5◻_0.5)Fe³⁺₂O₄	Iso. 432 : P4₃32
Trevorite	Ni²⁺Fe³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
'UM1994-06-O:AlCo'	CoAl₂O₄
Vuorelainenite	Mn²⁺V³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
Zincochromite	ZnCr₂O₄	Iso. m3m(4/m32/m) : Fd3m

Forms a series with:

Magnetite

Jacobsite-Magnetite Series

Common AssociatesHide

Associations Based on Photo Data:

43 photos of Jacobsite associated with Calcite	CaCO₃
14 photos of Jacobsite associated with Plumboferrite	Pb[Fe³⁺_10.67Mn²⁺_0.33Pb]O_18.33
12 photos of Jacobsite associated with Zincite	ZnO
11 photos of Jacobsite associated with Andradite	Ca₃Fe³⁺₂(SiO₄)₃
11 photos of Jacobsite associated with Manganosite	MnO
7 photos of Jacobsite associated with Alleghanyite	Mn²⁺₅(SiO₄)₂(OH)₂
7 photos of Jacobsite associated with Tephroite	Mn²⁺₂(SiO₄)
7 photos of Jacobsite associated with Lindqvistite	Pb₂Mn²⁺Fe₁₆O₂₇
6 photos of Jacobsite associated with Kutnohorite	CaMn²⁺(CO₃)₂
5 photos of Jacobsite associated with Kellyite	Mn²⁺₂Al(AlSiO₅)(OH)₄

Related Minerals - Strunz-mindat Grouping Hide

4.BB.	Chenmingite	FeCr₂O₄	Orth. mmm(2/m2/m2/m) : Pnma
4.BB.	Thermaerogenite	CuAl₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.	Chukochenite	LiAl₅O₈	Orth. mmm(2/m2/m2/m) : Imma
4.BB.	Elgoresyite	(Mg₅Si₂)O₉	Mon. 2/m : B2/m
4.BB.	Jianmuite	ZrTi⁴⁺Ti³⁺₅Al₃O₁₆	Tet. 4 : I4
4.BB.	Dellagiustaite	V²⁺Al₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.	Garpenbergite	Mn₆◻AsSbO₁₀(OH)₂	Orth. mmm(2/m2/m2/m)
4.BB.	Magnéliite	Ti³⁺₂Ti⁴⁺₂O₇	Tric. 1 : P1
4.BB.05	Qandilite	(Mg,Fe³⁺)₂(Ti,Fe³⁺,Al)O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Chromite	Fe²⁺Cr³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Filipstadite	(Fe³⁺_0.5Sb⁵⁺_0.5)Mn₂O₄	Iso.
4.BB.05	Wernerkrauseite	Ca(Fe³⁺,Mn³⁺)₂Mn⁴⁺O₆	Orth. mmm(2/m2/m2/m) : Pnma
4.BB.05	Harmunite	CaFe₂O₄	Orth. mmm(2/m2/m2/m) : Pbcm
4.BB.05	Zincochromite	ZnCr₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Deltalumite	(Al_0.67◻_0.33)Al₂O₄	Tet. 42m : P4m2
4.BB.05	Franklinite	Zn²⁺Fe³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Cochromite	CoCr₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	'Nichromite'	(Ni,Co,Fe)(Cr,Fe,Al)₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Hercynite	Fe²⁺Al₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Gahnite	ZnAl₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Galaxite	Mn²⁺Al₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Guite	Co²⁺Co³⁺₂O₄	Iso.
4.BB.05	Coulsonite	Fe²⁺V³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Vuorelainenite	Mn²⁺V³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Spinel	MgAl₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Cuprospinel	Cu²⁺Fe³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Manganochromite	Mn²⁺Cr₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Magnesiocoulsonite	MgV₂O₄	Iso. m3m(4/m32/m)
4.BB.05	Trevorite	Ni²⁺Fe³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Magnesiochromite	MgCr₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Magnesioferrite	MgFe³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Magnetite	Fe²⁺Fe³⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.05	Ulvöspinel	TiFe²⁺₂O₄	Iso. m3m(4/m32/m) : Fd3m
4.BB.10	Hausmannite	Mn²⁺Mn³⁺₂O₄	Tet. 4/mmm(4/m2/m2/m) : I4₁/amd
4.BB.10	Hetaerolite	ZnMn₂O₄	Tet. 4/mmm(4/m2/m2/m) : I4₁/amd
4.BB.10	Manganostibite	(Mn,Fe)₇SbAsO₁₂	Orth. mmm(2/m2/m2/m)
4.BB.15	Titanomaghemite	(Ti⁴⁺_0.5◻_0.5)Fe³⁺₂O₄	Iso. 432 : P4₃32
4.BB.15	Maghemite	(Fe³⁺_0.67◻_0.33)Fe³⁺₂O₄	Iso. 432 : P4₁32
4.BB.20	Tegengrenite	(Mn³⁺_0.5Sb⁵⁺_0.5)Mg₂O₄	Trig. 3 : R3
4.BB.25	Xieite	Fe²⁺Cr₂O₄	Orth. mmm(2/m2/m2/m)
4.BB.30	Carmeltazite	ZrAl₂Ti₄O₁₁	Orth. mmm(2/m2/m2/m) : Pnma
4.BB.35	Feiite	Fe²⁺₂(Fe²⁺Ti⁴⁺)O₅	Orth. mmm(2/m2/m2/m) : Cmcm
4.BB.40	Maohokite	MgFe₂O₄	Orth. mmm(2/m2/m2/m) : Pnma
4.BB.45	Tschaunerite	(Fe²⁺)(Fe²⁺Ti⁴⁺)O₄	Orth. mmm(2/m2/m2/m) : Cmcm

Fluorescence of JacobsiteHide

In UV light:

Not fluorescent in ultraviolet

Other InformationHide

Magnetism:

Ferromagnetic

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for JacobsiteHide

mindat.org URL:

https://www.mindat.org/min-2061.html
Please feel free to link to this page.

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for JacobsiteHide

Reference List:

Damour, A.A. (1869) Notice sur la jakobsite, nouvelle espèce minérale. Comptes Rendus Hebdomadaires des Séances de l’Académie des Sciences: 69: 168-172.

Nordenskiöld, A. E. (1877) Nya Mineralier från Långban. 6. Ganomalit, in Mineralogiska meddelanden. Geologiska Föreningen i Stockholm Förhandlingar, 3 (12). 382-384 doi:10.1080/11035897709446407

Nordenskiöld, A. E. (1877) Nya Mineralier från Långban. 7. Jakobsit, in Mineralogiska meddelanden. Geologiska Föreningen i Stockholm Förhandlingar, 3 (12). 384 doi:10.1080/11035897709446407as Jakobsit

Flink, Gustav (1886) Ak. Stockholm Bh.: 12(2): 2, 20.

Fermor, L.L. (1909) Geological Survey of India, Rec.: 37: 199.

Johansson, K. (1928) IV. Mineralogische Mitteilungen. Zeitschrift für Kristallographie - Crystalline Materials, 68 (1). 87-118 doi:10.1524/zkri.1928.68.1.87

Orcel, Jean, Pavlovitch, Stoyan (1931) Les caractères microscopiques des oxydes de manganèse et des manganites naturels (Détermination de leurs pouvoirs réflecteurs) Bulletin de Minéralogie, 54 (5) 108-179 doi:10.3406/bulmi.1931.4130

Palache, C., Berman, H., Frondel, C. (1944) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume I: 698-707.

Fleischer, M. (1944) New mineral names. American Mineralogist, 29 (1-2). 73-74

Wickman, Frans E. (1947) A Redetermination of the Space-group of Jacobsite. Geologiska Föreningen i Stockholm Förhandlingar, 69 (3) 363-365 doi:10.1080/11035894709444633

Hastings, Julius M., Corliss, Lester M. (1956) Neutron Diffraction Study of Manganese Ferrite. Physical Review, 104 (2). 328-331 doi:10.1103/physrev.104.328

WEISZ, R. S. (1957) Oxidation of Manganese Ferrite. Journal of the American Ceramic Society, 40 (4). 139-142 doi:10.1111/j.1151-2916.1957.tb12590.x

Butler, S.R, Buessem, W.R. (1962) Variations of the lattice constant and line width of x-ray reflections from manganese ferrite. Journal of Physics and Chemistry of Solids, 23. 1661-1669 doi:10.1016/0022-3697(62)90249-4

Butler, Sidney R., Buessem, Wilhelm R. (1963) Magnetization of Manganese Ferrite. Journal of Applied Physics, 34 (6). 1754-1757 doi:10.1063/1.1702673

Červinka, L. (1965) Comparison of lattice vibrations in nickel- and manganese-ferrite single crystals. Czechoslovak Journal of Physics, 15 (6). 425-427 doi:10.1007/bf01689254

Paulus, Max, Hamelin, André (1968) Croissance des cristaux de ferrite de manganese. Journal of Crystal Growth, 3. 500-503 doi:10.1016/0022-0248(68)90209-1

Červinka, L., Vetterkind, D. (1968) The influence of low temperature (293°K–4·5°K) on the structure of manganese-rich manganese ferrite. Journal of Physics and Chemistry of Solids, 29. 171-179 doi:10.1016/0022-3697(68)90267-9

de Waal, S. A. (1969) Nickel minerals from Barberton, South Africa: I. Ferroan trevorite. American Mineralogist, 54 (7-8) 1204-1208

Fleischer, Michael (1973) New mineral names. American Mineralogist, 58 (5-6). 560-562

Jirák, Z., Zajíček, J. (1978) A low temperature neutron diffraction study of manganese ferrite. Czechoslovak Journal of Physics, 28 (11). 1315-1316 doi:10.1007/bf01599971

(1980) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine, 43 (332) 1053-1055 doi:10.1180/minmag.1980.043.332.17

Essene, E. J., Peacor, D. R. (1983) Crystal chemistry and petrology of coexisting galaxite and jacobsite and other spinel solutions and solvi. American Mineralogist, 68 (3-4) 449-455

Denecke, Melissa A., Gunßer, W., Buxbaum, G., Kuske, P. (1992) Manganese valence in precipitated manganese ferrite. Materials Research Bulletin, 27 (4). 507-514 doi:10.1016/0025-5408(92)90029-y

Beard, James S., Tracy, Robert J. (2002) Spinels and other oxides in Mn-rich rocks from the Hutter Mine, Pittsylvania County, Virginia, U.S.A.: Implications for miscibility and solvus relations among jacobsite, galaxite, and magnetite. American Mineralogist, 87 (5) 690-698 doi:10.2138/am-2002-5-611

(2005) Jacobsite. Handbook of Mineralogy. Mineralogical Society of America

Ahmed, Y.M.Z. (2010) Synthesis of manganese ferrite from non-standard raw materials using ceramic technique. Ceramics International, 36. 969-977 doi:10.1016/j.ceramint.2009.11.020

Gottesmann, Wolfram; Gottesmann, Bärbel; Seifert, Wolfgang; Unger, Hans (2015) The jacobsite-magnetite series at the Tumurtijn-ovoo Fe-Mn-Zn skarn deposit, Mongolia. Neues Jahrbuch für Mineralogie - Abhandlungen, 192 (3). 289-306 doi:10.1127/njma/2015/0286

Peter, Johannes, Trapp, Maximilian, Lauterbach, Stefan, Gollé-Leidreiter, Philipp, Kolb, Ute, Kleebe, Hans-Joachim (2021) Exomorphism of jacobsite precipitates in bixbyite single crystals from the Thomas Range in Utah. American Mineralogist, 106 (7) 1163-1171 doi:10.2138/am-2021-7715ccbyncnd

Wen, Shanshan, Chen, Bing, Zhang, Junhong, Zhan, Wenlong, He, Zhijun, Gao, Lihua (2023) Systematic Study on the Synthesis and Magnetism Properties of Manganese Ferrite MnFe2O4 by an Oxidation Roasting Process. Crystals, 13 (10) doi:10.3390/cryst13101509

Chubarov, Victor M. (2023) New Approach for Direct Determination of Manganese Valence State in Ferromanganese Nodules by X-ray Fluorescence Spectrometry. Minerals, 13 (10). 1329 doi:10.3390/min13101329

Localities for JacobsiteHide

Showing 238 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

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Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Antarctica
East Antarctica Wilkes Land Clark Peninsula ⓘ Manganese lens	Plimer et al. (1983)

Australia
New South Wales Inglis Co. Danglemah ⓘ Mount Sally Mine	Stillwell et al. (1950)
Yancowinna Co. Broken Hill district ⓘ Broken Hill	Ramdohr (1950)
South Australia Pastoral Unincorporated Area Iron Baron ⓘ Iron Baron Mine	Collection of M.Willoughby. ...
Iron Knob ⓘ Iron Monarch Main Pit	Pilkington et al. (1979)

Austria
Salzburg Tamsweg District Tweng ⓘ Fuchs Alp - Fuchs lake area	Meixner (1935)
ⓘ Radiolarite outcrop (incl. Gfrererloch)	Strasser (1989)
Zell am See District Kaprun Mooserboden reservoir ⓘ Mooser dam	Strasser (1989)
Styria Bruck-Mürzzuschlag District Sankt Barbara im Mürztal Veitsch Kleinveitsch Kaiblinggraben ⓘ Friedlkogel (Friedelkogel; Heinzlkogel)	Tropper et al. (2001) +1 other reference
Tyrol Innsbruck-Land District Navis ⓘ Navis stream (Navis creek)	Kolitsch et al. (2019)
Staffelsee ⓘ Metamorphosed manganese ore lens	Kolitsch et al. (2019)
Trins ⓘ Kirchdachspitze	Kolitsch et al. (2021)
Lienz District Kals am Großglockner Kals valley ⓘ Ködnitz valley	Neinaveie (1979)
Prägraten am Großvenediger Timmelbach valley ⓘ Wunwand (Wunspitze)	Kolitsch et al. (2017)

Brazil
Bahia Urandi ⓘ Urandi Mn deposit	Varentsov (1996)
Ceará ⓘ Lagoa do Riacho Mn deposit	Santos et al. (2021)

Canada
British Columbia Skeena Mining Division Haida Gwaii Graham Island Klashwun Point ⓘ Shag Rock Mn Occurrence	Peatfield (n.d.) +1 other reference
Ontario Kenora District GTP Block 7 Township ⓘ Mattabi Mine	Geoffrey Khalil Abdallah (1990)

Chile
Magallanes ⓘ Sarmiento Ophiolite complex ?	Singer et al. (2005)

China
Guangxi Chongzuo Daxin Co. ⓘ Xialei Mine (Daxin Mine)	Dairong Yan et al. (2006)
Hainan Baoting Co. ⓘ Damao Mine	Liangkai Gu (1986)
Hubei Huanggang Luotian Co. Hejiawan ⓘ Hejiawan Mn deposit	Jingqu Yao (1992)
ⓘ Xiaojiawan Mn deposit	Jingqu Yao (1992)
Wuhan Huangpi District ⓘ Tuanshangou Mine	Jingqu Yao (1992)
Hunan Yongzhou Lanshan Co. ⓘ Lanshan Fe-Mn deposit	Zhao et al. (2024)
Inner Mongolia Baotou City Bayan Obo mining district ⓘ Bayan Obo deposit	Yi-Li et al. (2023)
Chifeng City (Ulanhad League; Chifeng Prefecture) Linxi County Guandi ⓘ Guandi Ag-Au deposit	Baisheng Zhang (1998)
Liaoning Chaoyang Chaoyang County ⓘ Wafangzi Fe-Mn deposit	Fan Delian et al. (1992)
Xinjiang Kezilesu Autonomous Prefecture (Kizilsu Autonomous Prefecture; Qizilsu Autonomous Prefecture) Wuqia Co. (Ulugqat Co.; Ulughchat Co.) ⓘ Malkantu deposit
Yunnan Dali Heqing County ⓘ Heqing Mn deposit	Yuchun Yang (1990)

Czech Republic
Central Bohemian Region Kutná Hora District Kutná Hora ⓘ Kaňk

Egypt
Red Sea Governorate ⓘ Abu Dabbab Massif	Alekseev et al. (2023)
ⓘ Nuweibi Complex	Alekseev et al. (2023)
South Sinai Governorate Um Bogma area ⓘ Um Bogma Formation	Afify et al. (2022)

France
Auvergne-Rhône-Alpes Savoie Saint-Jean-de-Maurienne Bessans ⓘ Le Coin	Chopin (1978)
Bonneval-sur-Arc ⓘ Ouille du Midi	Chopin (1978)
Brittany Morbihan Lorient Groix Primiture ⓘ Les Saisies	Chauris (2014)
Grand Est Vosges Saint-Dié-des-Vosges Gérardmer ⓘ Le Haut-Poirot	Weil et al. (1958)
Occitanie Haute-Garonne Saint-Gaudens Boutx ⓘ Tuc Usclat	Inventaire minéralogique de la France ...

Germany
Rhineland-Palatinate Mayen-Koblenz Mendig Mendig ⓘ In den Dellen quarries	Hentschel (1987)
ⓘ Thelenberg	Hentschel (1983) +1 other reference
Wingertsberg ⓘ Pumice quarries	Hentschel (1987)
Pellenz Kruft ⓘ Krufter Ofen	Hentschel (1987)
Vordereifel Ettringen ⓘ Caspar quarry	Blaß et al. (1994)
Vulkaneifel Gerolstein Hohenfels-Essingen ⓘ Feuerberg	Juroszek et al. (Ti 5 Fe)

Ghana
Oti Region ⓘ Akokrowa-Asukawkaw-Okanease range	Addae et al. (2026)
Western Region Tarkwa ⓘ Nsuta Mine (Insuta Mine; Nsuta-Gaywin Manganese concession; Nsuta-Wassaw)	Mücke et al. (1999)

Greece
South Aegean Milos Milos Island ⓘ Cape Vani	Kilias +6 other references
Paros Paros Vounia Lefkon ⓘ Thapsana skarn	Tombros et al. (2023)

India
Andhra Pradesh Visakhapatnam District ⓘ Kodúr Mines	Roy (1960)
Vizianagaram District ⓘ Garbham deposit	Sivaprakash (1980)
ⓘ Garividi deposit	Sivaprakash (1981)
ⓘ Koduru Mine	Sivaprakash (1980)
ⓘ Sadanandapuram deposit	Sivaprakash (1980)
Indian Plate Eastern Ghats Belt ⓘ Boringpadar-Amath Sector	Yadav (2022)
Karnataka Ballari District Bellary-Hospet iron belt Sandur ⓘ Donimalai Mine	Rao et al. (1979)
Madhya Pradesh Jabalpur Division Balaghat District ⓘ Netra manganese project	Dasgupta et al. (1987)
Chhindwara District ⓘ Gowari Wadhona Mine	Roy et al. (1968)
Jhabua District ⓘ Kajlidongri Mine	Tait et al. (2005)
Maharashtra Nagpur Division Bhandara District ⓘ Chikala	Dasgupta et al. (1984) +1 other reference
ⓘ Dongri Buzurg Mine	Roy (1968)
Odisha Rayagada District ⓘ Nishikhal Mn deposit	Acharya et al. (1997)
Sundargarh District (Sundergarh District) ⓘ Ghoriajhor-Monmunda area	Nicholson et al. (1997)

Iran
Sistan and Baluchestan Province Zahedan County Dehoo ⓘ Dehoo manganese deposit	Lotfi et al. (2017)

Israel
ⓘ Negev	AmMin 45:734
Southern District Beersheba Subdistrict Tamar Regional Council Hatrurim Basin Wadi Zohar ⓘ Paralava occurrence	Galuskin et al. (2024)
ⓘ Tsomet Hatrurim	Galuskin et al. (2016)
ⓘ Ye’elim Mount	Galuskina et al. (2026)

Italy
Aosta Valley Saint-Marcel Servette-Chuc mining complex ⓘ Praborna Mine	Cenki-Tok et al. (2006)
Lombardy Sondrio Province Lanzada ⓘ Scerscen Valley	- (n.d.)
ⓘ Lower Scerscen Glacier	Oberti et al. (2018)
Sardinia Sassari Province Uri ⓘ Scalacavalli	Fadda (1989)
Sicily Metropolitan City of Messina Nizza di Sicilia ⓘ Palazzo di Bozzo	Rendiconti della Società Mineralogica Italiana et al. (abstract) +1 other reference

Japan
Aichi Prefecture Kitashitara County Shitara ⓘ Taguchi mine	Fukuoka (1981)
Fukui Prefecture Mikatakaminaka District Wakasa-cho ⓘ Fujii mine	加藤昭 (1980) +1 other reference
Fukuoka Prefecture ⓘ Kawachi mine	- (n.d.)
Fukushima Prefecture Iwaki City ⓘ Gozaisho Mine	MATSUBARA et al. (1996)
Gunma Prefecture Kiryu City ⓘ Kurokawa mine	Minerals in Japan (Field Best Encyclopedia V. 15, 2003)
ⓘ Mogurazawa mine	Matsubara Satoshi et al. (1980)
ⓘ Shohwa mine (Showa mine)	FUKUOKA et al. (1977)
Midori City Seta ⓘ Rito mine (Ritoh mine)	- (n.d.) +1 other reference
ⓘ Higashikonaka deposit	University of Tokyo collection
Iwate Prefecture Karumai ⓘ Kurano mine	- (n.d.)
Kuji City Yamagata ⓘ Hinosawa mine	- (n.d.)
ⓘ Kawai mine	- (n.d.)
ⓘ Shimizugawa mine	- (n.d.)
ⓘ Takamatsu mine	- (n.d.)
ⓘ Taki mine	Fukuoka (1981)
ⓘ Takinosawa mine	- (n.d.)
ⓘ Yokoji mine ?	- (n.d.)
Kunohe-gun Noda ⓘ Noda-Tamagawa mine	Watanabe (1959)
ⓘ Sainokami mine	- (n.d.)
Kuzumaki ⓘ Fujikura mine	Tanida et al. (1982)
Morioka City ⓘ Kumanosawa mine	- (n.d.)
Shimohei District ⓘ Daiichi-Fukushi mine	- (n.d.)
ⓘ Fukushi mine	- (n.d.)
Tanohata ⓘ Tanohata mine	- (n.d.)
ⓘ Warabisawa mine	- (n.d.)
Yamada-machi ⓘ Otaniyama mine	- (n.d.)
Yamada ⓘ Toyomane mine	- (n.d.)
Kochi Prefecture Kami City ⓘ Matsuo mine	加藤昭 (1980)
Kochi City ⓘ Kunimiyama mine ?	Takabatake (1956)
Nankoku city Ananai mine ⓘ Fukinaro deposit	Nakagawa et al. (2009)
Kyoto Prefecture Kyoto City Kita-ku ⓘ Senzoku-Gohoutani mine (Gohodani mine)	Yamada (2004)
Ukyou-ku ⓘ Ashidani mine (Ashitani mine)	Masutomi Museum specimens
Nantan City Miyama ⓘ Tanba mine	Yamada (2004)
ⓘ Yatani mine	Yamada (2004)
Soraku District Wazuka-cho ⓘ Sono mine
Mie Prefecture Toba City ⓘ Kamo mine (Toba mine)	Yamada (2004)
Miyazaki Prefecture Nishiusuki District Takachiho ⓘ Akimoto mine	Uehara et al. (2014)
Nagano Prefecture Kamiina District ⓘ Hamayokokawa mine (Hamayokogawa mine)	Fukuoka (1981)
ⓘ Asahi orebody	Akira Kato (2011)
ⓘ Principal orebody	Akira Kato (2011)
Saga Prefecture Karatsu City Kyuuragi-machi ⓘ Kyuuragi mine (Kyuragi mine)	- (n.d.) +1 other reference
Saitama Prefecture Chichibu City Urayama ⓘ Hirogawara mine (Hirogawarasawa)	K. Nishikubo et al. (2005)
Hanno City ⓘ Komatsu mine	Yamada (2004)
ⓘ Oukura mine (Ohkura mine)	Kato (2010)
Shiga Prefecture Gamo District ⓘ Yaei mine	Yamada (2004)
Kusatsu City ⓘ Ioi mine	Katsu Kaneko (1956)
Otsu City ⓘ Hira mine	Masutomi Museum specimen (Kyoto)
Takashima City ⓘ Gentadani mine	Masutomi Museum specimen (Kyoto)
ⓘ Ohgawa mine	Yamada (2004)
Tochigi Prefecture ⓘ Hokkohji mine	加藤昭 (1980) +1 other reference
ⓘ Kamibishi mine	Hiroaki Tano specimens. +1 other reference
Kanuma City ⓘ Kaso Mine	Akira Kato (undated manuscript) +1 other reference
ⓘ Nogami mine	University of Tokyo collection
ⓘ Nomine mine	Petrov (n.d.)
ⓘ Ogaki mine	University of Tokyo collection
Tokyo Metropolis Nishitama district Okutama-cho ⓘ Kiyokawa mine	加藤昭 (1980) +1 other reference
Wakayama Prefecture Iwade city Afuzu-mura ⓘ Iimori mine	BANNO et al. (2012) +1 other reference
Tanabe City ⓘ Tamatani mine	Masutomi Museum specimen (Kyoto)
Yamaguchi Prefecture Iwakuni City ⓘ Renge mine ?	Lee (1955)

Kazakhstan
Akmola Region ⓘ Novodneprovskoe deposit	Dyussembayeva et al. (2013)
Ulytau Region Karazhal ⓘ Ushkatyn deposits (Ushkatan)	Kayupova (1965) +1 other reference
ⓘ Ushkatyn No. 1 deposit	Kayupova (1964)
Zhayrem (Zhairem) ⓘ Ushkatyn No. 3 deposit (Ushkatyn-III deposit)	Frank Dzubeck +3 other references
Zhanaarka District Atasu Mine ⓘ Zhomart Fe-Mn deposit (Dzhumart)	Kayupova (1963)

Kenya
Nandi County ⓘ Tinderet volcano	A. N. Zaitsev et al. (2013)

Madagascar
Atsimo-Andrefana Ampanihy District Maniry ⓘ Vohidrakitsy deposits	Dekoninck et al. (2024)

Mexico
Chihuahua Aquiles Serdán Municipality ⓘ Santa Eulalia Mining District	Megaw (2023)

Middle East
ⓘ Hatrurim Formation	Vapnik et al. (2014)

Mongolia
Sühbaatar Province Baruun-Urt District ⓘ Tumurtiin Ovoo Zn deposit (Tomortiin Ovoo; Tumurtijn-ovoo)	Gottesmann et al. (2009) +1 other reference

Morocco
Béni Mellal-Khénifra Region Azilal Province ⓘ Idikel Mn deposit	Varentsov (1996)
ⓘ Jbel Saghro

Namibia
Otjozondjupa Region Omatako Constituency ⓘ Otjosondu	von Bezing (2007) +2 other references
Otavi Constituency Kombat ⓘ Kombat Mine	American Mineralogist +1 other reference
ⓘ Asis West sector	Criddle et al. (1990)

North Macedonia
Probistip Municipality Kratovo-Zletovo ore district ⓘ Zletovo Mine	Bulletin of the Chemists and Technologists of Macedonia et al. (2004) +1 other reference

Norway
Nordland Lødingen Vestpolltind ⓘ Vestpolltind Iron Deposits	Krogh (1977)
Telemark Tokke Botnedal ⓘ Brandsnuten manganese deposit	Westerweld (1961)

Pacific Ocean
Sea of Japan ⓘ Belyaevsky Rise	Volokhin et al. (2020, April)

Papua New Guinea
Oro Province ⓘ Aikora River	Cabri et al. (2022)

Poland
Lower Silesian Voivodeship Wrocław County Gmina Kobierzyce ⓘ Pustków Wilczkowski	Ł. Kruszewski PXRD & pXRF data (paper in preparation)

Romania
Maramureș County Târgu Lăpuș ⓘ Răzoare	Udubasa et al. (1996) +3 other references
Suceava County Iacobeni ⓘ Arșița mine	minerals-of-the-carpathians.eu (2008)
Tolovanu ⓘ Tolovanu (Tolovan) Mn deposit	Hîrtopanu (1997) +1 other reference

Russia
Bashkortostan ⓘ Bikkulovskoe deposit	Brusnitsyn et al. (2009)
Kamchatka Krai Yelizovsky District ⓘ Mutnovskoe	Okrugin et al. (an Example of Mutnovsky Geothermal Area, Southern Kamchatka) +1 other reference
Primorsky Krai Khasansky District ⓘ Kedrovaya Pad Nature Reserve	Timofeeva et al. (2014)

Slovakia
Košice Region Rožňava District ⓘ Čučma	Szakáll et al. (2013)
ⓘ Čierna baňa	Martin Števko-unpublished +1 other reference
Dobšiná ⓘ ~~Dobšiná mining district~~	Ozdín et al. (2010)

South Africa
Northern Cape John Taolo Gaetsewe District Municipality Joe Morolong Local Municipality ⓘ Avontuur deposit	Coetzee et al. (2024)
Hotazel ⓘ Hotazel Mine	Wilson et al. (1978)
ⓘ Leinster deposit	Miyano et al. (1987)
ⓘ Mamatwan Mine	Preston (2009) +1 other reference
ⓘ Middelplaats Mine	Fitton (2022) +1 other reference
N'Chwaning Mines ⓘ N'Chwaning II Mine	Cairncross et al. (1995)
ⓘ Perth Mine	South African Micromount Society (2014)
ⓘ Wessels Mine	Cairncross et al. (1995)
Namakwa District Municipality Khâi-Ma Local Municipality Aggeneys ⓘ Gamsberg zinc mine	Rozendaal et al. (2017)
Okiep Copper District Nababeep Nababeep tungsten mines ⓘ Nababeep West Mine (Nababeep Near West mine) ?	Söhnge (1950)

Spain
Balearic Islands Majorca Llucmajor ⓘ Cova del Pas de Vallgornera	Onac et al. (2014) +1 other reference
Basque Country Guipúzcoa (Gipuzkoa) Deba ⓘ Aixa Cave	Onac (2025)
Canary Islands Las Palmas Province Fuerteventura Fuerteventura Basal Complex ⓘ Esquinzo ultra-alkaline complex	Casillas et al. (2024)
Santa Cruz de Tenerife Province Tenerife ⓘ ~~Los Humilladeros~~	Dill et al. (2023)
ⓘ ~~Poris de Abona~~	Dill et al. (2023)

Sudan
Red Sea Red Sea Hills Derudeb District ⓘ Abu Samar	www.gras-sd.com (2004)

Sweden
Dalarna County Hedemora Garpenberg ⓘ Garpenberg Norra Mine	Min Mag 66 (2)
Örebro County Hällefors Grythyttan ⓘ Sjögruvan	Palache et al. (1951) +1 other reference
Lindesberg Nyberget ⓘ Nyberget ore field	Roy (1972)
ⓘ Gladtjärns Mine	Igelström (1890)
ⓘ Mangruvan	Holtstam (1997)
ⓘ Slöjdartorp	Koark (1970)
Värmland County Filipstad ⓘ Gåsborn	Damman (1989)
Långban Ore District ⓘ Långban Mine	Nordenskiöld (1877) +2 other references
ⓘ Anrikningsverk dump	Wiklund et al. (2003)
ⓘ Garden dump	Nysten (2014)
ⓘ The Pole dump	Lorin (2003)
Nordmark mining district Jakobsberg ore field ⓘ Jakobsberg Mine (TL)	Foshag (1928) +2 other references
ⓘ Nordmark Odal Field	Gatedal (n.d.) +1 other reference
ⓘ Brattfors Mine	Holtstam et al. (1995)
ⓘ Finngruvan-Gröngruvan	Nysten (2003)
ⓘ Kitteln Mine	Magnusson (1929) +1 other reference
ⓘ Moss mine	Magnusson (1929) +1 other reference
Persberg ore district Pajsberg ⓘ Harstigen Mine	Nysten (2003)
ⓘ Stora Pajsberg Mine
Västmanland County Norberg ⓘ Häste ore field	Ounchanum et al. (1987)
ⓘ Nya Jakobsgruvan	Nysten (2020)
ⓘ Unga Assersorskan Mine	Nysten et al. (2016)
Västra Götaland County Åmål Strandhem ore field ⓘ Kesebol mine	Holtstam +6 other references

Switzerland
Grisons Viamala Region Ferrera Ausserferrera ⓘ Fianel	Stalder et al. (1998)
ⓘ Schmorrasgrat-South	Brugger J. (1996) +1 other reference
St. Gallen Sarganserland Sargans ⓘ Gonzen Mine	Stalder et al. (1998)
Valais Leuk Turtmann-Unterems Turtmann Valley Pipjitälli ⓘ Pipji glacier	Stalder et al. (1998) +1 other reference
Visp Täsch Täsch Valley ⓘ Sparrenflue	Stalder et al. (1998)

Tanzania
Arusha Region Monduli District ⓘ Kerimasi volcano	Zaitsev (2010)
ⓘ Trig Point Hill flow	Mitchell et al. (2021)

Turkey
Denizli Province Tavas Ulukent ⓘ Ulukent Mn deposit	Öztürk (1997)
Yozgat Province Sorgun District ⓘ Eymir manganese deposit	Oksuz (2018)
Yozgat District ⓘ Derbent	Oksuz (2018)

UK
England Cornwall Lostwithiel ⓘ Restormel Royal Iron Mine (Trinity Mine)	Cotterell (2010)
Wales Gwynedd Aberdaron Nant-y-Gadwen ⓘ Nant Mine	Cotterell (2006)
Rhiw ⓘ Benallt Mine	Liferovich et al. (2006)
Llanfair ⓘ Llyn du Bach mine ?	Cotterell (2013)

Ukraine
Ternopil Oblast Chortkiv Raion Ivane-Zolote ⓘ Dniester Group	Sungatullin et al. (2018)

USA
Arizona Cochise County Bisbee Escabrosa Ridge ⓘ No. 4 claim	Grant et al. (2005)
California Nevada County Spenceville Mining District Limekiln ⓘ Manga-Chrome Mine (Manga Chrome; Magna-Chrome Mine; Duggan Mine; Steams and Owens [?])	Flohr (1992) +1 other reference
ⓘ Smith prospect	Flohr et al. (1992)
Trinity County Klamath Mountains Trinity Mountains Altoona Mining District Boulder Peak ⓘ Railroad Lease Mine (Section Two; Southern Pacific Railroad lease; Railroad lease; Railroad Mine; Joe Sturdivant; Keno Compagnie Francise; Section 11 Mine; Southern Pacific)	- (2005)
Connecticut Middlesex County Haddam ⓘ Jail Hill Road locality (Jail Hill Quarry)	Schooner (circa 1980s)
Georgia Cherokee County Victoria (Nahenta) ⓘ Bell-Star Mine	Rocks & Min.:64:189 +1 other reference
Massachusetts Hampshire County Plainfield ⓘ Betts Manganese Mines	Plante (1992)
Michigan Iron County Iron River Mineral Hills Homer-Wauseca Group ⓘ Homer Mine	Shawn Carlson (2010)
ⓘ Marquette County	Heinrich et al. (2004)
Champion Township Champion ⓘ Champion Mine	Rocks & Minerals: 61:328. +1 other reference
New Jersey Sussex County Franklin ⓘ Franklin Mine	Frondel et al. (1965) +2 other references
ⓘ Trotter Mine
North Carolina Alleghany County Sparta Bald Knob ⓘ Bald Knob deposit	Rocks & Min.: 60:130-135.
Utah Juab County ⓘ Thomas Range	Johannes Peter +4 other references
Virginia Pittsylvania County James River-Roanoke River Mn-Fe-Ba Mining District ⓘ Hutter Mine (Herter Magnetite Mine)	Beard et al. (2002) +1 other reference
Washington Clallam County Lake Crescent Area ⓘ Littleton Mine	Cannon (1975)
ⓘ State Lease Prospect	Cannon (1975)
Jefferson County ⓘ Dosewallips Pass	Cannon (1975)
ⓘ Elkhorn Prospect	Cannon (1975)
Mason County North Fork of the Skokomish River Area ⓘ Apex Prospect	Cannon (1975)
ⓘ Triple Trip Mine	Cannon (1975)

Vietnam
East Vietnam Sea ⓘ D6	Xuan et al. (2020)

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