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Frohbergite

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Formula:
FeTe2
System:
Orthorhombic
Hardness:
3 - 4
Member of:
Name:
For Dr. Max Hans Frohberg, mining geologist, Toronto, Canada.

Classification of Frohbergite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
2.EB.10a

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
2.12.2.3

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
3.9.10

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
9 : Sulphides etc. of Fe
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http://www.mindat.org/min-1612.html
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Type Occurrence of Frohbergite

Year of Discovery:
1946

Occurrences of Frohbergite

Geological Setting:
Hydrothermal deposits rimming chalcopyrite or as inclusions in gold, petzite, chalcopyrite

Physical Properties of Frohbergite

Metallic
Diaphaneity (Transparency):
Opaque
Hardness (Mohs):
3 - 4
Hardness (Vickers):
VHN100=250 - 297
Density:
8.057 g/cm3 (Calculated)

Crystallography of Frohbergite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnnm
Space Group Setting:
Pnnm
Cell Parameters:
a = 5.29Å, b = 6.27Å, c = 3.86Å
Ratio:
a:b:c = 0.844 : 1 : 0.616
Unit Cell Volume:
V 128.03 ų (Calculated from Unit Cell)
Z:
2
Morphology:
tiny equant grains

Optical Data of Frohbergite

Type:
Anisotropic
Anisotropism:
Strong, orange red to inky blue
Colour in reflected light:
White with bluish or pinkish tint
Pleochroism:
Weak

Chemical Properties of Frohbergite

Formula:
FeTe2
Essential elements:
All elements listed in formula:

Relationship of Frohbergite to other Species

Series:
Forms a series with Mattagamite (see here)
Member of:
Other Members of Group:
2.EB.05aAurostibiteAuSb2
2.EB.05bBambollaiteCu(Se,Te)2
2.EB.05aCattieriteCoS2
2.EB.05aErlichmaniteOsS2
2.EB.05aFukuchiliteCu3FeS8
2.EB.05aGeversitePtSb2
2.EB.05aHaueriteMnS2
2.EB.05aInsizwaitePt(Bi,Sb)2
2.EB.05aKrut'aiteCuSe2
2.EB.05aLauriteRuS2
2.EB.05aPenroseite(Ni,Co,Cu)Se2
2.EB.05aPyriteFeS2
2.EB.05aSperrylitePtAs2
2.EB.05aTrogtaliteCoSe2
2.EB.05aVaesiteNiS2
2.EB.05aVillamaninite(Cu,Ni,Co,Fe)S2
2.EB.05aDzharkeniteFeSe2
2.EB.05aGaotaiiteIr3Te8
2.EB.10bAlloclasiteCo1-xFexAsS
2.EB.10dCostibiteCoSbS
2.EB.10aFerroseliteFeSe2
2.EB.10cGlaucodot(Co0.50Fe0.50)AsS
2.EB.10aKulleruditeNiSe2
2.EB.10aMarcasiteFeS2
2.EB.10aMattagamiteCoTe2
2.EB.10eParacostibiteCoSbS
2.EB.10ePararammelsbergiteNiAs2
2.EB.10fOeniteCoSbAs
2.EB.15aAnduoite(Ru,Os)As2
2.EB.15aClinosaffloriteCoAs2
2.EB.15aLöllingiteFeAs2
2.EB.15aNisbiteNiSb2
2.EB.15aOmeiite(Os,Ru)As2
2.EB.15cPaxiteCuAs2
2.EB.15aRammelsbergiteNiAs2
2.EB.15aSafflorite(Co,Ni,Fe)As2
2.EB.15bSeinäjokite(Fe,Ni)(Sb,As)2
2.EB.20ArsenopyriteFeAsS
2.EB.20GudmunditeFeSbS
2.EB.20Osarsite(Os,Ru)AsS
2.EB.20Ruarsite(Ru,Os)AsS
2.EB.25CobaltiteCoAsS
2.EB.25GersdorffiteNiAsS
2.EB.25Hollingworthite(Rh,Pt,Pd)AsS
2.EB.25Irarsite(Ir,Ru,Rh,Pt)AsS
2.EB.25JolliffeiteNiAsSe
2.EB.25KrutoviteNiAs2
2.EB.25MaslovitePtBiTe
2.EB.25MicheneritePdBiTe
2.EB.25PadmaitePdBiSe
2.EB.25PlatarsitePtAsS
2.EB.25TestibiopalladitePdTe(Sb,Te)
2.EB.25TolovkiteIrSbS
2.EB.25UllmanniteNiSbS
2.EB.25Willyamite(Co,Ni)SbS
2.EB.25ChangchengiteIrBiS
2.EB.25MayingiteIrBiTe
2.EB.25Hollingsworthite
2.EB.25KalungaitePdAsSe
2.EB.25MilotaitePdSbSe
2.EB.30UrvantsevitePd(Bi,Pb)2
2.EB.35RheniiteReS2
3.9.1PyrrhotiteFe1-xS (x = 0 to 0.17)
3.9.3PyriteFeS2
3.9.4MarcasiteFeS2
3.9.5GreigiteFe2+Fe23+S4
3.9.6Mackinawite(Fe,Ni)9S8
3.9.7Smythite(Fe,Ni)3+xS4 (x=0-0.3)
3.9.8Achavalite(Fe,Cu)Se
3.9.9FerroseliteFeSe2
3.9.11LöllingiteFeAs2
3.9.12ArsenopyriteFeAsS
3.9.13GudmunditeFeSbS

Other Names for Frohbergite

Name in Other Languages:
German:Frohbergit
Simplified Chinese:碲铁矿
Spanish:Frohbergita

Other Information

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 Frohbergite

Reference List:
THOMPSON, R.M. (1947): Frohbergite, FeTe2, a new member of the marcasite group. Contributions to Canadian Mineralogy, University of Toronto Studies, Geological Series 51, 35-40. Abstracted in American Mineralogist 32, 210.
THOMPSON, R.M. (1949): The telluride minerals and their occurrence in Canada. American Mineralogist 34, 342-382.
RUCKLIDGE, J. (1969): Frohbergite, montbrayite and a new PbBBi telluride. Canadian Mineralogist 9, 709-716.
BROSTIGEN, G. & KJEKSHUS, A. (1970): Compounds with marcasite type crystal structure. V. The crystal structures of FeS2, FeTe2, and CoTe2. Acta Chemica Scandinavica 24, 1925-1940.

Internet Links for Frohbergite

Localities for Frohbergite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Brazil
 
  • Goiás
    • Mara Rosa district
      • Mara Rosa
Econ Geol. (1995) 90:308-321; de Oliveira, C. G., de Queiroz, C. L., & Pimentel, M. M. (2008). The arenopólis-mara rosa Gold-Copper Belt, Neoproterozoic Goiás Magmatic Arc. Brazilian Journal of Geology, 30(2), 219-221.; Kuyumjian, R. M. (2008). Magmatic arc and associated gold, copper, silver, and barite deposits in the state of Goiás, central Brazil: characteristics and speculations. Brazilian Journal of Geology, 30(2).
Canada
 
  • British Columbia
    • Omenica Mining Division
      • Lindquist Lake
Handbook of Mineralogy
  • Québec
    • Abitibi-Témiscamingue
      • La Vallée-de-l'Or RCM
        • Val d'Or
Econ.Geol.: 83; 395-404
      • Rouyn-Noranda TE
Econ.Geol.: 83; 395-404
THOMPSON, R.M. (1947): Frohbergite, FeTe2, a new member of the marcasite group. Contributions to Canadian Mineralogy, University of Toronto Studies, Geological Series 51, 35-40. Abstracted in American Mineralogist 32, 210. THOMPSON, R.M. (1949): The telluride minerals and their occurrence in Canada. American Mineralogist 34, 342-382. RUCKLIDGE, J. (1969): Frohbergite, montbrayite and a new Pb-Bi telluride. Canadian Mineralogist 9, 709-716.
China
 
  • Shandong Province
    • Linyi Prefecture
      • Pingyi Co.
        • Tongshi complex
Xuefeng Yu (2001): Shandong Geology 17(3-4), 59-64
Finland
 
  • Eastern Finland Region
Hytönen,K. (1999): Suomen Mineraalit. Geologian tutkimuskeskus. Erillisjulkaisu, Jyväskylä, 399 pp (p.346)
Kojonen, Kari, Johanson, Bo, Pakkanen, Lassi and O´Brien, Hugh 1991. Ilomantsin Korvilansuo Au-malmiaiheen mineralogiaa ja petrografiaa, 40 s. Geologian Tutkimuskeskus arkistoraportti M19/4244/-91/1/42.
Geological Survey of Finland 2008. Pampalo(Ward)-Gold Database.
  • Northern Finland Region
    • Kuusamo
Geological Survey of Finland 2008. Hangaslampi - Gold Database
Eilu, P. (2003). Exploration for orogenic gold deposits. Fennoscandian Exploration and Mining 2003. Rovaniemi, Finland ; Geological Survey of Finland 2007 Juomasuo - Gold Database
  • Western and Inner Finland Region
    • Orivesi
Economic Geology (1996) 91:1335-1353; Eilu, P. (2003). Exploration for orogenic gold deposits. Fennoscandian Exploration and Mining 2003. Rovaniemi, Finland
France
 
  • Brittany
    • Finistère
      • Bolazec
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Japan
 
  • Hokkaido
    • Sapporo
      • Nishi-ku
Nakata et al (1989) Mineralogical Magazine, 53, 387-388.
  • Honshu Island
    • Chubu Region
      • Shizuoka Prefecture
        • Shimoda City
          • Rendaiji
Gunnar Farber and Luigi Chiappino specimens, 2007 (but one of these, analyzed by F. Keutsch, showed only gold and gold tellurides).
Kazakhstan
 
  • Akmola Province (Aqmola Oblysy; Akmolinskaya Oblast')
P.M. Kartashov analytical data
Norway
 
  • Finnmark
    • Kautokeino
Neumann, H. (1985): Norges Mineraler. Norges Geologiske Undersøkelse Skrifter 68. (p. 39).
Romania
 
  • Alba Co.
    • Zlatna (Zalatna; Zalathna)
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
  • Hunedoara Co.
    • Brad
Econ.Geol.: 83; 395-404; Singer, D.A., Berger, V.I., and Moring, B.C. (2008): US Geological Survey Open-File Report 2008-1155.
    • Deva
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Econ.Geol.: 83; 395-404
M. Lupulescu (1996) Tellurantimony and frohbergite from Stanija ore deposit (Apuseni Mtns.): a discussion. Anal.Univ.Buc., Geol., XLV, p. 3-9.
Saudi Arabia
 
  • Mintaqah Al Madinah
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Econ.Geol.: 83; 395-404
  • Mintaqah Tabuk
    • Wejh
Econ.Geol.: 83; 395-404
Sweden
 
  • Hälsingland
    • Ljusdal
Nysten, P. & Annersten, H. (1984): The gold mineralization at Enåsen, central Sweden. Geologiska Foereningens i Stockholm Foerhandlingar 106, 245-256.
  • Västerbotten
    • Sandfors
No reference listed
T. Wikström, thesis from Stockholm University
Ukraine
 
  • Kiev Oblast' (Kyiv Oblast'; Kyivshchyna)
Bondarenko, S.; Grinchenko, O.; Semka, V. (2005): Au-Ag-Te-Se mineralization in the Potashnya gold deposit, Kocherov tectonic zone, Ukrainian Shield. Geokhimiya, Mineralogiya i Petrologiya 43, 20-25.
USA
 
  • Arizona
    • Cochise Co.
      • Bowie area
        • San Simon Basin (San Simon River; Bowie Chabazite deposit)
Handbook of Mineralogy, http://rruff.geo.arizona.edu/doclib/hom/frohbergite.pdf>
      • Tombstone Hills
        • Tombstone District
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 227; Williams, S.A. (1980b), The Tombstone District, Cochise Co., AZ, Min.Rec.: 11: 251-256.
  • Colorado
    • Gunnison Co.
      • Vulcan District (Cebolla District; Domingo District)
        • Vulcan
Frank Keutsch collection, polished section SEM/EDS and reflected light
    • Montgomery Co.
      • Carolina Slate Belt
Callahan,J.E,Craig,J.R Solberg,T.N,1995, Telluride mineralization of the southeastern United States,Southeastern Geology,v.35, no.3, pg.139-151
Uzbekistan
 
  • Tashkent Viloyati (Toshkent)
    • Angren Region
      • Chatkal-Kuraminskii Range
Kovalenker, V. et al New Data on Minerals (2003): 38: 45-56
Pasi Eilu (2003) Exploration for orogenic gold deposits. Fennoscandian Exploration and Mining 2003 Rovaniemi, Finland December 2003
Mineral and/or Locality  
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