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Freboldite

A valid IMA mineral species - grandfathered
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02295690017271923208229.jpg
Freboldite

Temple Mountain Mining District, Emery County, Utah, USA
02295690017271923208229.jpg
Freboldite

Temple Mountain Mining District, Emery County, Utah, USA
02295690017271923208229.jpg
Freboldite

Temple Mountain Mining District, Emery County, Utah, USA
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About FrebolditeHide

07495280017271923247482.jpg
Georg Frebold
Formula:
CoSe
Colour:
Copper-red
Lustre:
Metallic
Hardness:
2½ - 3
Specific Gravity:
7.70 (Calculated)
Crystal System:
Hexagonal
Member of:
Nickeline Group
Name:
Named in honor of Georg Frebold (1 December 1891, Hannover, Germany - 24 February 1948, Barsinghausen, Germany), professor at the Geolog. Inst. d. Techn. Hochschule in Hannover, Germany.
The Co analogue of achávalite, klockmannite, and sederholmite. Chemically similar to trogtalite and bornhardtite.


Unique IdentifiersHide

Mindat ID:
1602
Long-form identifier:
mindat:1:1:1602:1

IMA Classification of FrebolditeHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1955

Classification of FrebolditeHide

Strunz-mindat (2026):
2.CC.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
C : With Ni, Fe, Co, PGE, etc.
Dana 8th ed.:
2.8.11.10

2 : SULFIDES
8 : AmXp, with m:p = 1:1
Hey's CIM Ref.:
3.10.4

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
10 : Sulphides etc. of Co

Mineral SymbolsHide

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

SymbolSourceReference for Standard
FbdIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of FrebolditeHide

Lustre:
Metallic
Transparency:
Opaque
Colour:
Copper-red
Hardness:
2½ - 3 on Mohs scale
Density:
7.70 g/cm3 (Calculated)

Optical Data of FrebolditeHide

Anisotropism:
less than niccolite
Colour in reflected light:
Similar to nickeline, but more intense violet in oil
Comments:
Similar in color to nickeline, more intense violet in oil

Chemistry of FrebolditeHide

Mindat Formula:
CoSe
Element Weights:
Element% weight
Se57.262 %
Co42.738 %

Calculated from ideal end-member formula.
Elements listed:
Co, Se - search for minerals with similar chemistry

Crystallography of FrebolditeHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm(6/m2/m2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Setting:
P63/mmc
Cell Parameters:
a = 3.61 Å, c = 5.28 Å
Ratio:
a:c = 1 : 1.463
Unit Cell V:
59.59 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Massive, grains

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0011564FrebolditeWyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Crystal Structures 1 85-23719630293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.05 Å(100)
1.066 Å(100)
0.963 Å(100)
2.4 Å(50)
1.71 Å(50)
1.08 Å(50)
0.992 Å(50)
Comments:
Steinbruch, Germany.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of FrebolditeHide

Type Locality:
ⓘ Trogtal Quarries, Harz (Landkreis Goslar), Goslar District, Lower Saxony, Germany
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
Dolomite veinlets.

Other Language Names for FrebolditeHide

Relationship of Freboldite to other SpeciesHide

Member of:
Nickeline Group
Other Members of Nickeline Group:
AchávaliteFeSeHex. 6/mmm(6/m2/m2/m) : P63/mmc
BreithauptiteNiSbHex. 6/mmm(6/m2/m2/m) : P63/mmc
DriekopitePtBiHex. 6/mmm(6/m2/m2/m) : P63/mmc
KotulskitePd(Te,Bi)2-x (x ≈ 0.4)Hex.
LangisiteCoAsHex. 6 : P63
NickelineNiAsHex. 6/mmm(6/m2/m2/m) : P63/mcm
SederholmiteNiSeHex. 6/mmm(6/m2/m2/m) : P63/mmc
SobolevskitePdBiHex.
StumpflitePtSbHex. 6/mmm(6/m2/m2/m) : P63/mmc
SudburyitePdSbHex. 6/mmm(6/m2/m2/m) : P63/mmc
VavříniteNi2SbTe2Hex. 6/mmm(6/m2/m2/m) : P63/mmc
ZlatogoriteNiCuSb2Trig. 3m(32/m) : P31m

Related Minerals - Strunz-mindat GroupingHide

2.CC.EliopoulositeV7S8Trig. 32 : P3221
2.CC.TilkerodeitePd2HgSe3Trig. 3m(32/m) : P3m1
2.CC.'UM2007-26-S:CuFeIrNiPtRh'(Ir,Cu,Ni,Pt,Rh,Fe)9S11
2.CC.Proxitwelvefoldite Pd3Ni4Te8Tet. 4/mmm(4/m2/m2/m) : P42/mnm
2.CC.FerrotorryweiseriteRh5Fe10S16Trig. 3m(32/m) : R3m
2.CC.TamuraiteIr5Fe10S16Trig. 3m(32/m) : R3m
2.CC.Crowningshieldite(Ni0.9Fe0.1)SHex. 6/mmm(6/m2/m2/m) : P63/mmc
2.CC.KuvaeviteIr5Ni10S16Trig. 3m(32/m) : R3m
2.CC.TorryweiseriteRh5Ni10S16Trig. 3m(32/m) : R3m
2.CC.05AchávaliteFeSeHex. 6/mmm(6/m2/m2/m) : P63/mmc
2.CC.05LangisiteCoAsHex. 6 : P63
2.CC.05SederholmiteNiSeHex. 6/mmm(6/m2/m2/m) : P63/mmc
2.CC.05NickelineNiAsHex. 6/mmm(6/m2/m2/m) : P63/mcm
2.CC.05SobolevskitePdBiHex.
2.CC.05JaipuriteCoSHex.
2.CC.05KotulskitePd(Te,Bi)2-x (x ≈ 0.4)Hex.
2.CC.05ZlatogoriteNiCuSb2Trig. 3m(32/m) : P31m
2.CC.05StumpflitePtSbHex. 6/mmm(6/m2/m2/m) : P63/mmc
2.CC.05SudburyitePdSbHex. 6/mmm(6/m2/m2/m) : P63/mmc
2.CC.05BreithauptiteNiSbHex. 6/mmm(6/m2/m2/m) : P63/mmc
2.CC.10PyrrhotiteFe1-xSMon.
2.CC.10Smythite(Fe,Ni)3+xS4 (x=0-0.3)Trig. 3m(32/m) : R3m
2.CC.10TroiliteFeSHex. 6/mmm(6/m2/m2/m) : P63/mmc
2.CC.15Ruthenarsenite(Ru,Ni)AsOrth. mmm(2/m2/m2/m) : Pnma
2.CC.15Westerveldite(Fe,Ni,Co)AsOrth. mmm(2/m2/m2/m)
2.CC.15ModderiteCoAsOrth. mmm(2/m2/m2/m)
2.CC.15MinakawaiteRhSbOrth. mmm(2/m2/m2/m) : Pnma
2.CC.15CherepanoviteRhAsOrth. mmm(2/m2/m2/m) : Pnma
2.CC.20'UM1990-38-S:CuFeIrNiPtRh'(Ni,Fe,Rh,Cu,Ir,Pt)S
2.CC.20MilleriteNiSTrig. 3m : R3m
2.CC.20MäkineniteNiSeTrig. 3m
2.CC.25MackinawiteFeSTet. 4/mmm(4/m2/m2/m) : P4/nmm
2.CC.30VavříniteNi2SbTe2Hex. 6/mmm(6/m2/m2/m) : P63/mmc
2.CC.30'Hexatestibiopanickelite'(Pd,Ni)(Sb,Te) ?Hex.
2.CC.35bCooperitePtSTet. 4/mmm(4/m2/m2/m) : P42/mmc
2.CC.35aVysotskitePdSTet. 4/m : P42/m
2.CC.35aBraggitePdPt3S4Tet. 4/m : P42/m
2.CC.45JacutingaitePt2HgSe3Trig. 3m(32/m) : P3m1
2.CC.50'Imgreite'NiTe (?)Hex.

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 FrebolditeHide

References for FrebolditeHide

Localities for FrebolditeHide

Showing 4 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.
Canada
 
  • Saskatchewan
Dana's New Mineralogy
Germany (TL)
 
  • Lower Saxony
    • Goslar District
      • Harz (Landkreis Goslar)
Ramdohr et al. (1955) +3 other references
  • Saxony-Anhalt
    • Mansfeld-Südharz
      • Mansfeld
Ramdohr et al. (1955) +2 other references
USA
 
  • Utah
    • Emery County
Mineralogical Society of America - ...
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