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Freboldite

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About FrebolditeHide

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


Classification of FrebolditeHide

Approved, 'Grandfathered' (first described prior to 1959)
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.
2.8.11.10

2 : SULFIDES
8 : AmXp, with m:p = 1:1
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

Physical Properties of FrebolditeHide

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

Optical Data of FrebolditeHide

Type:
Anisotropic
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

Chemical Properties of FrebolditeHide

Formula:
CoSe

Crystallography of FrebolditeHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/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

Type Occurrence of FrebolditeHide

Other Language Names for FrebolditeHide

Relationship of Freboldite to other SpeciesHide

Member of:
Other Members of this group:
Achávalite(Fe,Cu)SeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
BreithauptiteNiSbHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
KotulskitePd(Te,Bi)Hex.
Langisite(Co,Ni)AsHex. 6 : P63
NickelineNiAsHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
Sederholmitebeta-NiSeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
SobolevskitePd(Bi,Te)Hex.
StumpflitePt(Sb,Bi)Hex.
Sudburyite(Pd,Ni)SbHex.
VavříniteNi2SbTe2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
ZlatogoriteNiCuSb2Trig.

Common AssociatesHide

Related Minerals - Nickel-Strunz GroupingHide

2.CC.UM2007-26-S:CuFeIrNiPtRh(Ir,Cu,Ni,Pt,Rh,Fe)9S11
2.CC.05Achávalite(Fe,Cu)SeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.05BreithauptiteNiSbHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.05KotulskitePd(Te,Bi)Hex.
2.CC.05Langisite(Co,Ni)AsHex. 6 : P63
2.CC.05NickelineNiAsHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
2.CC.05Sederholmitebeta-NiSeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.05SobolevskitePd(Bi,Te)Hex.
2.CC.05StumpflitePt(Sb,Bi)Hex.
2.CC.05Sudburyite(Pd,Ni)SbHex.
2.CC.05JaipuriteCoSHex.
2.CC.05ZlatogoriteNiCuSb2Trig.
2.CC.10PyrrhotiteFe7S8Mon.
2.CC.10Smythite(Fe,Ni)3+xS4 (x=0-0.3)Trig. 3m (3 2/m) : R3m
2.CC.10TroiliteFeSHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.15CherepanoviteRhAsOrth. mmm (2/m 2/m 2/m) : Pnma
2.CC.15Modderite(Co,Fe)AsOrth.
2.CC.15Ruthenarsenite(Ru,Ni)AsOrth.
2.CC.15Westerveldite(Fe,Ni,Co)AsOrth.
2.CC.20MilleriteNiSTrig. 3m : R3m
2.CC.20Mäkineniteγ-NiSeTrig.
2.CC.20UM1990-38-S:CuFeIrNiPtRh(Ni,Fe,Rh,Cu,Ir,Pt)S
2.CC.25Mackinawite(Fe,Ni)9S8Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
2.CC.30Hexatestibiopanickelite(Pd,Ni)(Sb,Te)Hex.
2.CC.30VavříniteNi2SbTe2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.CC.35aBraggite(Pt,Pd,Ni)STet.
2.CC.35bCooperitePtSTet. 4/mmm (4/m 2/m 2/m) : P42/mmc
2.CC.35aVysotskite(Pd,Ni)STet.

Related Minerals - Dana Grouping (8th Ed.)Hide

2.8.11.1NickelineNiAsHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
2.8.11.2BreithauptiteNiSbHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.8.11.3Sederholmitebeta-NiSeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
2.8.11.4Hexatestibiopanickelite(Pd,Ni)(Sb,Te)Hex.
2.8.11.9Langisite(Co,Ni)AsHex. 6 : P63

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.10.1Cobaltpentlandite(Co,Ni,Fe)9S8Iso. m3m (4/m 3 2/m) : Fm3m
3.10.2LinnaeiteCo2+Co3+2S4Iso.
3.10.3CattieriteCoS2Iso. m3 (2/m 3) : Pa3
3.10.5BornhardtiteCo2+Co3+2Se4Iso. m3m (4/m 3 2/m) : Fd3m
3.10.6TrogtaliteCoSe2
3.10.7HastiteFeSe2Orth.
3.10.8MattagamiteCoTe2Orth.
3.10.9Modderite(Co,Fe)AsOrth.
3.10.10Safflorite(Co,Ni,Fe)As2Orth. mmm (2/m 2/m 2/m) : Pnnm
3.10.11ClinosaffloriteCoAs2Mon. 2/m : P21/m
3.10.12SkutteruditeCoAs3Iso. m3 (2/m 3) : Im3
3.10.13CobaltiteCoAsSOrth. mm2 : Pca21
3.10.14ParacostibiteCoSbSOrth.
3.10.15CostibiteCoSbSOrth. mm2 : Pmn21
3.10.16AlloclasiteCo1-xFexAsSMon. 2 : P21
3.10.17Glaucodot(Co0.50Fe0.50)AsSOrth. mm2 : Pmn21
3.10.18CarrolliteCu(Co,Ni)2S4Iso. m3m (4/m 3 2/m) : Fd3m

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.

References for FrebolditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ramdohr P, Schmitt M (1955) Vier neue natürliche Kobaltselenide vom Steinbruch Trogtal bei Laufenthal im Harz. Neues Jahrbuch für Mineralogie, Monatshefte 1955, 133-142
Strunz H (1957) NiAs-typus und verwandte: Freboldit. in Mineralogische Tabellen, 3rd edition, Leipzig, Geest and Portig 98-98
Fleischer M (1956) New mineral names. American Mineralogist: 41: 164.
Fleischer M (1959) New mineral names. American Mineralogist: 44: 907.

Internet Links for FrebolditeHide

Localities for FrebolditeHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Saskatchewan
Dana's New Mineralogy
Germany (TL)
 
  • Lower Saxony
    • Goslar
      • Langelsheim
        • Lautenthal
Am. Mineral. (1956) 41, 164-165; Neues Jahrb. Mineral., Monatsh. (1955) 133–142; Weiss, S. (1990) Mineralfundstellen Atlas, Deutschland West. Weise Verlag, München, 320 pages.; Cabral, A. R., Koglin, N., & Bratz, H. (2012). Gold-bearing ferroselite (FeSe2) from Trogtal, Harz, Germany, and significance of its Co/Ni ratio. Journal of Geosciences, 57(4), 265-272.
  • Saxony-Anhalt
    • Harz
Wittern: "Mineralfundorte in Deutschland", 2001; Tischendorf, G. (1969). Sources of elements in selenide mineralization near Tilkerode (Harz). International Geology Review, 11(11), 1298-1301.
USA
 
  • Utah
    • Emery Co.
      • San Rafael Mining District (San Rafael Swell)
Handbook of Mineralogy
 
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