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Freboldite

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




Formula:
CoSe
System:HexagonalColour:Copper-red
Hardness:2½ - 3
Member of:Nickeline Group
Name:For Professor Georg Frebold (1891–?), Hannover, Germany.
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
Geological Setting of type material:Dolomite veinlets

Physical Properties of Freboldite

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

Crystallography of Freboldite

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

Chemical Properties of Freboldite

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

Relationship of Freboldite to other Species

Member of:Nickeline Group
Other Members of Group:

- +
Common Associates:
TrogtaliteSphaleriteNickelineMilleriteHematite
GuanajuatiteFerroseliteClausthaliteChalcopyriteBornhardtite
Related Minerals - Nickel-Strunz Grouping):

- +
2.CC.UM2007-26-S:CuFeIrNiPtRh
(Ir,Cu,Ni,Pt,Rh,Fe)
 
9
S
 
11
2.CC.05Achavalite
(Fe,Cu)Se
2.CC.05Breithauptite
NiSb
2.CC.05Kotulskite
Pd(Te,Bi)
 
1-2
2.CC.05Langisite
(Co,Ni)As
2.CC.05Nickeline
NiAs
2.CC.05Sederholmite
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.10Pyrrhotite
Fe
 
1-x
S (x = 0 to 0.17)
2.CC.10Smythite
(Fe,Ni)
 
3+x
S
 
4
 (x=0-0.3)
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.20UM1990-38-S:CuFeIrNiPtRh
(Ir,Pt,Ni,Fe)S
2.CC.25Mackinawite
(Fe,Ni)
 
9
S
 
8
2.CC.30Hexatestibiopanickelite
Ni(Te,Sb)
2.CC.30Vavřínite
Ni
 
2
SbTe
 
2
2.CC.35aBraggite
(Pt,Pd,Ni)S
2.CC.35bCooperite
(Pt,Pd,Ni)S
2.CC.35aVysotskite
(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
3.10.8Mattagamite
CoTe
 
2
3.10.9Modderite
(Co,Fe)As
3.10.10Safflorite
(Co,Fe,Ni)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
 
1-x
Fe
 
x
AsS
3.10.17Glaucodot
(Co
 
0.50
Fe
 
0.50
)AsS
3.10.18Carrollite
Cu(Co,Ni)
 
2
S
 
4

Other Names for Freboldite

Other Languages:
German:Freboldit
Russian:Фребольдит
Spanish: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:

- +
Ramdohr, P. (1955): Neues Jahrb. Monatsh. Mineral., 133-142.

American Mineralogist: 41: 164.

American Mineralogist: 44: 907.

Internet Links for Freboldite

Search Engines:
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    • External Links:
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  • Look for Freboldite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Freboldite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Fabre Minerals - search for Freboldite specimens
  • Buy fine minerals and gemstones from Pala International
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  • Visit the Pueblo Gem and Mineral show, Tucson 2012
  • webminerals
  • The Arkenstone - Fine Minerals
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Search for Freboldite from all mineral dealers at minfind.com
  • Edwards Minerals - Fine Specimens
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  • Find Freboldite on www.crystalclassics.co.uk
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    • Localities for Freboldite

    The 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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    (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
    		Am. Mineral. (1956) 41, 164-165; Neues Jahrb. Mineral., Monatsh. (1955) 133–142; Weiss: "Mineralfundstellen, Deutschland West", 1990
    • Saxony-Anhalt
      • Harz Mts
    		Wittern: "Mineralfundorte in Deutschland", 2001
    USA
     
    • Utah
      • Emery Co.
        • San Rafael District (San Rafael Swell)
    		Handbook of Mineralogy
    Mineral and/or Locality
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