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Freboldite

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Temple Mountain, San Rafael District (San Rafael Swell), Emery Co., Utah, USA
© 2007, J. Weissman

Formula:
CoSe
System:HexagonalColour:Copper-red
Hardness:2½ - 3
This page provides mineralogical data about Freboldite.

Classification of Freboldite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/C.20-40
Nickel-Strunz 10th (pending) edition ID: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 edition ID: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
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Type Occurrence of Freboldite

Type Locality:Trogtal Quarries, Lautenthal, Harz Mts, Lower Saxony, Germany
Year of Discovery:1957

Physical Properties of Freboldite

Lustre:Metallic
Colour:Copper-red
Hardness (Mohs):2½ - 3

Crystallography of Freboldite

Crystal System:Hexagonal
Cell Parameters:a = 3.6Å, c = 5.3Å
Ratio:a:c = 1 : 1.472
Unit Cell Volume:V 59.49 ų (Calculated from Unit Cell)

Chemical Properties of Freboldite

Formula:
CoSe
Essential elements:Co, Se
All elements listed in formula:Co, Se

Relationship of Freboldite to other Species

Related Minerals - Nickel-Strunz Grouping):
2.CC.05Achavalite
FeSe
2.CC.05Breithauptite
NiSb
2.CC.05Hexatestibiopanickelite
Ni(Te,Sb)
2.CC.05Kotulskite
Pd(Te,Bi)
 
1-2
2.CC.05Langisite
(Co,Ni)As ratio Co:Ni = 5:1
2.CC.05Nickeline
NiAs
2.CC.05Sederholmite
NiSe Beta-NiSe
2.CC.05Sobolevskite
PdBi
2.CC.05Stumpflite
Pt(Sb,Bi)
2.CC.05Sudburyite
(Pd,Ni)Sb
2.CC.05Jaipurite
CoS
2.CC.05Zlatogorite
NiCuSb
 
2
2.CC.05Vavřínite
Ni
 
2
SbTe
 
2
2.CC.10Pyrrhotite
Fe
 
0.83-1
S
2.CC.10Smythite
(Fe,Ni)
 
9
S
 
11
2.CC.10Troilite
FeS
2.CC.15Cherepanovite
RhAs
2.CC.15Modderite
(Co,Fe)As
2.CC.15Ruthenarsenite
(Ru,Ni)As
2.CC.15Westerveldite
(Fe,Ni,Co)As
2.CC.20Millerite
NiS
2.CC.20Mäkinenite
γ-NiSe
2.CC.25Mackinawite
(Fe,Ni)
 
9
S
 
8
2.CC.30Braggite
(Pt,Pd,Ni)S
2.CC.30Cooperite
(Pt,Pd,Ni)S
2.CC.30Vysotskite
(Pd,Ni)S
Related Minerals - Hey's Index Grouping:
3.10.1Cobaltpentlandite
(Co,Ni,Fe)
 
9
S
 
8
3.10.2Linnaeite
Co
2+
 
Co
3+
2
S
 
4
3.10.3Cattierite
CoS
 
2
3.10.5Bornhardtite
Co
2+
 
Co
3+
2
Se
 
4
3.10.6Trogtalite
CoSe
 
2
3.10.7Hastite
CoSe
 
2
3.10.8Mattagamite
CoTe
 
2
3.10.9Modderite
(Co,Fe)As
3.10.10Safflorite
(Co,Fe)As
 
2
3.10.11Clinosafflorite
(Co,Fe,Ni)As
 
2
3.10.12Skutterudite
(Co,Fe,Ni)As
 
2-3
3.10.13Cobaltite
CoAsS
3.10.14Paracostibite
CoSbS
3.10.15Costibite
CoSbS
3.10.16Alloclasite
(Co
 
0.65
Fe
 
0.35
)AsS - CoAsS
3.10.17Glaucodot
(Fe
 
0.65
Co
 
0.35
)AsS - (Co
 
0.65
Fe
 
0.35
)AsS
3.10.18Carrollite
Cu(Co,Ni)
 
2
S
 
4

Other Names for Freboldite

German names:
Freboldit
Russian names:
Фребольдит
Spanish names:
Freboldita

Other Information

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

References for Freboldite

Reference List:American Mineralogist: 41: 164.

American Mineralogist: 44: 907.

Internet Links for Freboldite

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  • Raman and XRD data at RRUFF project
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  • Freboldite details from Handbook of Mineralogy (PDF)
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    Localities for Freboldite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Saskatchewan
    		Dana's New Mineralogy
    Germany
     
    • Lower Saxony
      • Harz Mts
        • Lautenthal
    		Weiss: "Mineralfundstellen, Deutschland West", 1990
    • Saxony-Anhalt
      • Harz Mts
    		Wittern: "Mineralfundorte in Deutschland", 2001
    Mineral and/or Locality
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