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Gillespite

A valid IMA mineral species - grandfathered

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Photos of Gillespite (40)Discuss Gillespite

Gillespite Gallery Search Photos of Gillespite

Edit Gillespite Add Synonym Edit CIF structures Clear Cache

Gillespite, etc.

Esquire No. 7 claim, Big Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA

Gillespite, etc.

Madrelena Mine, Tres Pozos, Baja California, Mexico

Gillespite

Gun claim, Wilson Lake, Itsi Mountain, Watson Lake mining district, Yukon, Canada

Gillespite, etc.

Esquire No. 7 claim, Big Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA

Gillespite, etc.

Madrelena Mine, Tres Pozos, Baja California, Mexico

Gillespite

Gun claim, Wilson Lake, Itsi Mountain, Watson Lake mining district, Yukon, Canada

Gillespite, etc.

Esquire No. 7 claim, Big Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA

Gillespite, etc.

Madrelena Mine, Tres Pozos, Baja California, Mexico

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About GillespiteHide

Formula:

BaFe²⁺Si₄O₁₀

Colour:

Deep red, rose-red.

Lustre:

Vitreous

Hardness:

3 - 4

Specific Gravity:

3.390 - 3.402

Crystal System:

Tetragonal

Member of:

Gillespite Group

Name:

Named in 1922 by Waldemar T. Schaller in honor of Mr. Frank Gillespie of Richardson, Alaska who collected the type specimen from a moraine near a claim he had staked.

Type Locality:

ⓘ Dry Delta, Alaska Range, Yukon-Koyukuk Census Area, Alaska, USA

This page provides mineralogical data about Gillespite.

Unique IdentifiersHide

Mindat ID:

1693

Long-form identifier:

mindat:1:1:1693:9

IMA Classification of GillespiteHide

IMA status:

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

Type description reference:

Schaller, W.T. (1922) Gillespite, a new mineral. Journal of the Washington Academy of Sciences, 12. p.7-8.

Classification of GillespiteHide

Strunz-mindat (2026):

9.EA.05

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

Dana 8th ed.:

71.2.3.2

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers

Hey's CIM Ref.:

14.7.7

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn

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
Gls	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Pronunciation of GillespiteHide

Pronunciation:

Play	Recorded by	Country
	Jolyon Ralph	United Kingdom

Physical Properties of GillespiteHide

Lustre:

Vitreous

Transparency:

Translucent

Colour:

Deep red, rose-red.

Streak:

Pink

Hardness:

3 - 4 on Mohs scale

Tenacity:

Brittle

Cleavage:

Distinct/Good
Very good on {001}, poor on {100}; very poor on {110}.

Density:

3.390 - 3.402 g/cm³ (Measured) 3.404 g/cm³ (Calculated)

Optical Data of GillespiteHide

Type:

Uniaxial (-)

RI values:

n_ω = 1.621 n_ε = 1.619

Max. Birefringence:

δ = 0.002
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Thickness: 30 µm Order divisions

Rotation:

Surface Relief:

High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.

Focus:

In focus

Interference Figure:

This shows the idealized uniaxial interference figure - the conoscopic (convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis centred and vertical. The coloured rings are isochromatics, computed with the same physics as the Michel-Lévy bar above; the dark cross is the isogyre.

For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.

Thickness: 30 µm

Pleochroism:

Strong

Comments:

O = colorless; E = red.

Chemistry of GillespiteHide

Mindat Formula:

BaFe²⁺Si₄O₁₀

Element Weights:

Element	% weight
O	34.370 %
Ba	29.501 %
Si	24.133 %
Fe	11.997 %

Calculated from ideal end-member formula.

Elements listed:

Ba, Fe, O, Si - search for minerals with similar chemistry

Common Impurities:

Al,Mn

Crystallography of GillespiteHide

Crystal System:

Tetragonal

Class (H-M):

4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal

Space Group:

P4/ncc

Setting:

P4/ncc

Cell Parameters:

a = 7.5164(6) Å, c = 16.0768(10) Å

Ratio:

a:c = 1 : 2.139

Unit Cell V:

908.28 Å³ (Calculated from Unit Cell)

Crystal StructureHide

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

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CIF File Best | x | y | z | a | b | c

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

ID	Species	Reference	Year	Locality	Pressure (GPa)	Temp (K)
0000897	Gillespite	Hazen R M, Finger L W (1983) High-pressure and high-temperature crystallographic study of the gillespite I-II phase transition American Mineralogist 68 595-603	1983	Fresno Co, California, USA	0	293
0000898	Gillespite	Hazen R M, Finger L W (1983) High-pressure and high-temperature crystallographic study of the gillespite I-II phase transition American Mineralogist 68 595-603	1983	Fresno Co, California, USA	0.9	293
0000899	Gillespite	Hazen R M, Finger L W (1983) High-pressure and high-temperature crystallographic study of the gillespite I-II phase transition American Mineralogist 68 595-603	1983	Fresno Co, California, USA	2.1	293
0020151	Gillespite	Knight K S, Marshall W G, Henderson C M B, Chamberlain A A (2013) Equation of state and a high-pressure structural phase transition in the gillespite-structured phase Ba0.5Sr0.5CuSi4O10 European Journal of Mineralogy 25 909-917	2013	synthetic	4.13	293
0000900	Gillespite	Hazen R M, Finger L W (1983) High-pressure and high-temperature crystallographic study of the gillespite I-II phase transition Note O2 y-coordinate changed to reproduce reported bond lengths American Mineralogist 68 595-603	1983	Fresno Co, California, USA	4.5	293
0020152	Gillespite	Knight K S, Marshall W G, Henderson C M B, Chamberlain A A (2013) Equation of state and a high-pressure structural phase transition in the gillespite-structured phase Ba0.5Sr0.5CuSi4O10 European Journal of Mineralogy 25 909-917	2013	synthetic	4.77	293
0001913	Gillespite	Miletich R, Allan D R, Angel R J (1997) The synthetic Cr2+ silicates BaCrSi4O10 and SrCrSi4O10: The missing links in the gillespite-type ABSi4O10 series CaCrSi4O10 American Mineralogist 82 697-707	1997		0	293
0001912	Gillespite	Miletich R, Allan D R, Angel R J (1997) The synthetic Cr2+ silicates BaCrSi4O10 and SrCrSi4O10: The missing links in the gillespite-type ABSi4O10 series SrCrSi4O10 American Mineralogist 82 697-707	1997		0	293
0001911	Gillespite	Miletich R, Allan D R, Angel R J (1997) The synthetic Cr2+ silicates BaCrSi4O10 and SrCrSi4O10: The missing links in the gillespite-type ABSi4O10 series BaCrSi4O10 American Mineralogist 82 697-707	1997		0	293
0000954	Gillespite	Belsky H L, Rossman G R, Prewitt C T, Gasparik T (1984) Crystal structure and optical spectroscopy (300 to 2200 nm) of CaCrSi4O10 American Mineralogist 69 771-776	1984		0	293
0000472	Gillespite	Hazen R M, Burnham C W (1975) The Crystal Structure of Gillespite II at 26 Kilobars: Correction and Addendum American Mineralogist 60 937-938	1975		0	293
0000429	Gillespite	Hazen R M, Burnham C W (1974) The crystal structures of gillespite I and II: A structure determination at high pressure American Mineralogist 59 1166-1176	1974		0	293
0000030	Gillespite	Pabst A (1943) Crystal structure of gillespite, BaFeSi4O10 American Mineralogist 28 372-390	1943		0	293
0000430	Gillespite	Hazen R M, Burnham C W (1974) The crystal structures of gillespite I and II: A structure determination at high pressure American Mineralogist 59 1166-1176	1974		2.6	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Gillespite'
loop_
_publ_author_name
'Hazen R M'
'Finger L W'
_journal_name_full 'American Mineralogist'
_journal_volume 68 
_journal_year 1983
_journal_page_first 595
_journal_page_last 603
_publ_section_title
;
 High-pressure and high-temperature crystallographic study of the gillespite I-II
 phase transition
 P = 1 bar
;
_database_code_amcsd 0000897
_chemical_compound_source 'Fresno Co, California, USA'
_chemical_formula_sum 'Ba Fe Si4 O10'
_cell_length_a 7.51605
_cell_length_b 7.51605
_cell_length_c 16.0759
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 908.144
_exptl_crystal_density_diffrn      3.405
_symmetry_space_group_name_H-M 'P 4/n c c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-y,1/2-x,1/2+z'
  '1/2+y,1/2+x,1/2-z'
  '1/2+y,-x,-z'
  '1/2-y,x,z'
  'x,1/2-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '1/2+x,1/2+y,-z'
  '1/2-x,1/2-y,z'
  'y,x,1/2+z'
  '-y,-x,1/2-z'
  '-y,1/2+x,-z'
  'y,1/2-x,z'
  '1/2-x,y,1/2+z'
  '1/2+x,-y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ba   0.25000   0.75000   0.00000
Fe   0.25000   0.25000   0.09190
Si   0.51960   0.93540   0.15490
O1   0.47400   0.97400   0.25000
O2   0.72280   0.99660   0.13750
O3   0.39050   0.02650   0.09020
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Ba 0.01425 0.01425 0.01008 0.00000 0.00000 0.00000
Fe 0.00687 0.00687 0.01807 0.00000 0.00000 0.00000
Si 0.00741 0.00750 0.01257 -0.00011 0.00153 -0.00153
O1 0.04121 0.04121 0.02226 -0.01374 0.01530 -0.01530
O2 0.00916 0.02518 0.02226 -0.00143 0.00000 0.00428
O3 0.01631 0.01116 0.03404 0.00429 -0.01224 -0.00245

X-Ray Powder DiffractionHide

Loading XRD data...

2θ (degrees) d-spacing (Å)

Data courtesy of RRUFF project at University of Arizona, used with permission.

Powder Diffraction Data:

d-spacing	Intensity
3.39 Å	(100)
4.41 Å	(70)
3.22 Å	(70)
3.09 Å	(50)
2.65 Å	(5)
2.39 Å	(50)
8.02 Å	(40)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
High-? alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits

Type Occurrence of GillespiteHide

Type Locality:

ⓘ Dry Delta, Alaska Range, Yukon-Koyukuk Census Area, Alaska, USA

Place of Conservation of Type Material:

Harvard University, Cambridge, Massachusetts, 90622; National Museum of Natural History, Washington, D.C., USA, 94347.

Associated Minerals at Type Locality:

Celsian

Hedenbergite

Quartz

Reference:

Schaller, W.T. (1922) Gillespite, a new mineral. Journal of the Washington Academy of Sciences, 12. p.7-8.

Other Language Names for GillespiteHide

Dutch:Gillespiet

German:Gillespit

Russian:Джиллеспит

Spanish:Gillespita

Relationship of Gillespite to other SpeciesHide

Member of:

Gillespite Group

Other Members of Gillespite Group:

Cuprorivaite	CaCuSi₄O₁₀	Tet. 4/mmm(4/m2/m2/m) : P4/ncc
Effenbergerite	BaCuSi₄O₁₀	Tet. 4/mmm(4/m2/m2/m) : P4/ncc
Wesselsite	SrCuSi₄O₁₀	Tet. 4/mmm(4/m2/m2/m) : P4/ncc

Common AssociatesHide

Associations Based on Photo Data:

66 photos of Gillespite associated with Sanbornite	BaSi₂O₅
15 photos of Gillespite associated with Quartz	SiO₂
11 photos of Gillespite associated with Titantaramellite	Ba₄(Ti,Fe³⁺,Fe²⁺,Mg)₄(B₂Si₈O₂₇)O₂Cl_x
11 photos of Gillespite associated with Celsian	Ba(Al₂Si₂O₈)
8 photos of Gillespite associated with Pellyite	Ba₂CaFe²⁺₂Si₆O₁₇
6 photos of Gillespite associated with Witherite	BaCO₃
6 photos of Gillespite associated with Taramellite	Ba₄(Fe³⁺,Ti,Fe²⁺,Mg)₄(B₂Si₈O₂₇)O₂Cl_x
5 photos of Gillespite associated with Cerchiaraite-(Fe)	Ba₄Fe³⁺₄O₃(OH)₃(Si₄O₁₂)[Si₂O₃(OH)₄]Cl
4 photos of Gillespite associated with 'Manganese-bearing Pellyite'	Ba₂Ca(Fe,Mn)₂Si₆O₁₇
4 photos of Gillespite associated with Meierite	Ba₄₄Si₆₆Al₃₀O₁₉₂Cl₂₅(OH)₃₃

Related Minerals - Strunz-mindat Grouping Hide

9.EA.	Hydroxymcglassonite-(K)	KSr₄Si₈O₂₀(OH) · 8H₂O	Tet.
9.EA.	Miyawakiite-(Y)	◻Y₄Fe₂(Si₈O₂₀)(CO₃)₄(H₂O)₃	Tet. 4/mmm(4/m2/m2/m) : I4/mcm
9.EA.	Bussyite-(Y)	(Y,REE,Ca)₃(Na,Ca)₆MnSi₉Be₅(O,OH,F)₃₄	Mon. 2 : B2
9.EA.	Hydroxyapophyllite-(NH4)	(NH₄)Ca₄(Si₈O₂₀)(OH)(H₂O)₈	Tet. 4/mmm(4/m2/m2/m)
9.EA.	Fluorapophyllite-(NH4)	NH₄Ca₄(Si₈O₂₀)F · 8H₂O	Tet. 4/mmm(4/m2/m2/m) : P4/mnc
9.EA.05	Cuprorivaite	CaCuSi₄O₁₀	Tet. 4/mmm(4/m2/m2/m) : P4/ncc
9.EA.05	Wesselsite	SrCuSi₄O₁₀	Tet. 4/mmm(4/m2/m2/m) : P4/ncc
9.EA.05	Effenbergerite	BaCuSi₄O₁₀	Tet. 4/mmm(4/m2/m2/m) : P4/ncc
9.EA.07	Fluorapophyllite-(Cs)	CsCa₄(Si₈O₂₀)F · 8H₂O	Tet.
9.EA.10	Ekanite	Ca₂ThSi₈O₂₀	Tet. 422 : I422
9.EA.15	Fluorapophyllite-(Na)	NaCa₄(Si₈O₂₀)F · 8H₂O	Orth.
9.EA.15	Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O	Tet. 4/mmm(4/m2/m2/m) : P4/mnc
9.EA.15	Hydroxyapophyllite-(K)	KCa₄(Si₈O₂₀)(OH,F) · 8H₂O	Tet. 4/mmm(4/m2/m2/m)
9.EA.20	Magadiite	Na₂Si₁₄O₂₉ · 11H₂O	Orth. mm2 : Fdd2
9.EA.25	Dalyite	K₂ZrSi₆O₁₅	Tric. 1 : P1
9.EA.25	Davanite	K₂TiSi₆O₁₅	Tric.
9.EA.30	Sazhinite-(La)	Na₃La[Si₆O₁₅] · 2H₂O	Orth. mm2 : Pmm2
9.EA.30	Sazhinite-(Ce)	Na₃CeSi₆O₁₅ · 2H₂O	Orth. mm2 : Pmm2
9.EA.35	Armstrongite	CaZr[Si₆O₁₅] · 3H₂O	Mon. 2/m : B2/m
9.EA.40	Okenite	Ca₁₀Si₁₈O₄₆ · 18H₂O	Tric. 1 : P1
9.EA.45	Perettiite-(Y)	Y₂Mn₄FeSi₂B₈O₂₄	Orth. mmm(2/m2/m2/m) : Pmna
9.EA.45	Nekoite	Ca₃Si₆O₁₅ · 7H₂O	Tric. 1 : P1
9.EA.45	Badakhshanite-(Y)	Y₂Mn₄Al(Si₂B₇BeO₂₄)	Orth. mmm(2/m2/m2/m) : Pnma
9.EA.47	Shlykovite	KCa[Si₄O₉(OH)] · 3H₂O	Mon. 2/m : P2₁/b
9.EA.50	Diegogattaite	Na₂CaCu₂Si₈O₂₀ · H₂O	Mon. 2/m : B2/m
9.EA.50	Cavansite	Ca(VO)Si₄O₁₀ · 4H₂O	Orth. mmm(2/m2/m2/m)
9.EA.52	Yangite	PbMnSi₃O₈ · H₂O	Tric. 1 : P1
9.EA.55	Pentagonite	Ca(VO)Si₄O₁₀ · 4H₂O	Orth. mm2
9.EA.60	Penkvilksite	Na₄Ti₂Si₈O₂₂ · 4H₂O	Orth. mmm(2/m2/m2/m) : Pbcn
9.EA.60	Tumchaite	Na₂Zr(Si₄O₁₁) · 2H₂O	Mon. 2/m : P2₁/b
9.EA.65	Nabesite	Na₂BeSi₄O₁₀ · 4H₂O	Orth. 222 : P2₁2₁2₁
9.EA.70	Ajoite	(K,Na)Cu₇AlSi₉O₂₄(OH)₆ · 3H₂O	Tric.
9.EA.75	Zeravshanite	Na₂Cs₄Zr₃[Si₁₈O₄₅]*2H₂O	Mon. 2/m : B2/b
9.EA.80	Bussyite-(Ce)	(Ce,REE)₃(Na,H₂O)₆MnSi₉Be₅(O,OH)₃₀F₄	Mon. 2/m : B2/b
9.EA.85	Plumbophyllite	Pb₂Si₄O₁₀ · H₂O	Orth. mmm(2/m2/m2/m) : Pbcn

Other InformationHide

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 GillespiteHide

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https://www.mindat.org/min-1693.html
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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 GillespiteHide

Reference List:

Schaller, W.T. (1922) Gillespite, a new mineral. Journal of the Washington Academy of Sciences, 12. p.7-8.

Schaller, Waldemar T. (1929) The properties and associated minerals of gillespite. American Mineralogist, 14 (9) 319-322

Pabst, Adolf (1942), The unit cell and space group of gillespite: Am. Min.: 28: 372-390; …(abstract): American Mineralogist: 26: 199 (1941).

Pabst, A. (1958) The structure of leached gillespite, a sheet silicate. American Mineralogist, 43 (9-10) 970-980

Hazen, Robert M., Burnham, and Charles W. (1974) The crystal structures of gillespite I and II: A structure determination at high pressure. American Mineralogist, 59 (11-12) 1166-1176

Hazen, Robert M. (1977) Mechanisms of transformation and twinning in gillespite at high pressure. American Mineralogist, 62 (5-6) 528-533

(2001) Gillespite. Handbook of Mineralogy. Mineralogical Society of America

Localities for GillespiteHide

Showing 12 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.

Hide all sections | Show all sections

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.


Canada
Yukon Watson Lake mining district Itsi Mountain Wilson Lake ⓘ Gun claim	Montgomery et al. (1972) +4 other references
Macmillan Pass ⓘ Birr claim	Dunning G.E. et al. (2018)

Mexico
Baja California Ensenada Municipality ⓘ El Alamo
ⓘ El Rosario Mine	Dunning et al. (2018)
Tres Pozos ⓘ Madrelena Mine	Alfors et al. (1984) +1 other reference

USA (TL)
Alaska Yukon-Koyukuk Census Area Alaska Range ⓘ Dry Delta (TL)	J.Washington Acad.Sci. (1922) +1 other reference
California Fresno County Big Creek-Rush Creek Mining District ⓘ Big Creek	Anonymous (1963) +2 other references
ⓘ Esquire No. 7 claim	Walstrom (n.d.) +3 other references
ⓘ Esquire No. 8 claim	Bob Walstrom +1 other reference
Rush Creek ⓘ Snow Cap Mine	Walstrom (n.d.)
Mariposa County East Belt Clearing House Mining District Clearing House Trumbull Peak ⓘ Trumbull Peak Ba-silicate deposit	Rogers (1932) +5 other references
Tulare County Dumtah ⓘ Baumann prospect (Bauman Ranch)	Pabst (1978) +2 other references

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Gillespite

About GillespiteHide

Unique IdentifiersHide

IMA Classification of GillespiteHide

Classification of GillespiteHide

Mineral SymbolsHide

Pronunciation of GillespiteHide

Physical Properties of GillespiteHide

Optical Data of GillespiteHide

Chemistry of GillespiteHide

Crystallography of GillespiteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of GillespiteHide

Other Language Names for GillespiteHide

Relationship of Gillespite to other SpeciesHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

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Related Minerals - Strunz-mindat Grouping Hide