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Ferroselite

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Formula:
FeSe2
System:
Orthorhombic
Colour:
Steel gray to tin white ...
Lustre:
Metallic
Hardness:
6 - 6½
Member of:
Name:
For the chemical composition.
Dimorph of:

Classification of Ferroselite

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.
2.12.2.2

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
3.9.9

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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First Recorded Occurrence of Ferroselite

Year of Discovery:
1955

Occurrences of Ferroselite

Geological Setting:
Red bed deposits of Colorado Plateau type.

Physical Properties of Ferroselite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Steel gray to tin white with rose tint, brass yellow
Comment:
Tarnishes to brassy tone
Streak:
Black
Hardness (Mohs):
6 - 6½
Hardness (Vickers):
VHN25=858 - 933 kg/mm2
Tenacity:
Very brittle
Density:
7.20 g/cm3 (Measured)    7.139 g/cm3 (Calculated)

Crystallography of Ferroselite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnnm
Space Group Setting:
Pnnm
Cell Parameters:
a = 4.8007Å, b = 5.776Å, c = 3.5850Å
Ratio:
a:b:c = 0.831 : 1 : 0.621
Unit Cell Volume:
V 99.41 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Slender prismatic crystals
Twinning:
Stellate and cruciform twins, twin lammellae in polished sections.

Optical Data of Ferroselite

Type:
Anisotropic
Anisotropism:
Strong, from greenish gray to lilac gray
Colour in reflected light:
White with gray-brown hue
Pleochroism:
Visible

Chemical Properties of Ferroselite

Formula:
FeSe2
Essential elements:
All elements listed in formula:
Common Impurities:
Co

Relationship of Ferroselite to other Species

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.10aFrohbergiteFeTe2
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.15aSaffloriteCoAs2
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
3.9.10FrohbergiteFeTe2
3.9.11LöllingiteFeAs2
3.9.12ArsenopyriteFeAsS
3.9.13GudmunditeFeSbS

Other Names for Ferroselite

Name in Other Languages:

Other Information

Other Information:
On heating becomes magnetic
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 Ferroselite

Reference List:
American Mineralogist: 41: 671.

Franz, E. D. (1972): X-ray diffraction data on mixed phases in the pyrite (FeS2)-ferroselite (FeSe2)/pyrrhotite (FeS)-achavalite (FeSe) system. Neues Jahrbuch für Mineralogie, Monatshefte 1972, 276-280.

Kjekshus, A., Rakke, T., Andresen, A. (1974): Compounds of the marcasite type crystal structure. IX. Structural data for FeAs2, FeSe2, NiAs2, NiSb2, and CuSe2. Acta Chemica Scandinavica, A28, 996-1000.

Internet Links for Ferroselite

Localities for Ferroselite

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.
Argentina
 
  • La Rioja
    • Famatina department
      • Famatina
        • Puerto Alegre
Paar, et al. (1996): Revista de la Asociacion Geologica Argentina 51 (4):304-312
    • General Lamadrid department
      • Villa Castelli
        • Sierra de Cacho
Milka K. de Brodtkorb (2002) Las Especies Minerales de la Republica Argentina. Vol. 1 (elements, sulphides and sulphosalts). (Asociacion Mineralogica Argentina); de Brodtkorb, M. K., & Crosta, S. (2010). Reseña de la ubicación geográfica de los seleniuros de la Sierra de Umango, provincia de La Rioja. Revista de la Asociación Geológica Argentina, 67(2), 272-279.
No reference listed
    • Vinchina Department
Recursos Minerales de la Republica Argentina, E. O. Zappettini Ed., Buenos Aires 1999 ISSN 0328-2325
China
 
  • Gansu Province
    • Gannan Autonomous Prefecture
      • Luqu Co.
Hanjie Wen, Yuzhuo Qiu, and Shirong Liu (2003): Geochimica 32(1), 21-28
  • Guizhou Province
    • Guiyang Prefecture
      • Kaiyang Co.
Chen Luming, Zhang Qifa, Li Deren, and Wang Guanxin (1993): Acta Mineralogica Sinica 13(1), 7-11. ; Jingxian Li and Jiajun Liu (2014): Resources & Industries 16(2), 90-97
  • Inner Mongolia Autonomous Region
    • Alxa League (Alashan Prefecture)
      • Alxa Right Banner (Alashan Youqi)
Jiayong Pan, Chengdong Liu, Guolin Guo, Anping Chen, Fazheng Chen, Zhaobin Yan, Yiping Chen, and Rengui Wu (2009): Acta Mineralogica Sinica 29(1), 44-48
Shenyun Wu, Deshang Wang, and Zhanwen Ma (1982): Acta Petrologica Mineralogica et Analytica 1(4), 25-30
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Central Bohemia Region
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Econ Geol (1997) 92:468-484
    • Plzeň Region
      • Planá u Mariánských Lázní (Plan)
Scharmová, M.: Nové nálezy selenidů a telluridů na uranových ložiskách Zadní Chodov a Vítkov II. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1998, roč. 6, s. 212-216.
  • Moravia (Mähren; Maehren)
    • Vysočina Region
      • Nové Město na Moravě
Kvaček, M.: Selenides from the deposits of Western Moravia, Czechoslovakia – Part II. Acta Universitatis Carolinae – Geologica, 1979, vol. 23, nos. 1-2, s. 15-38. ; Econ Geol (1997) 92:468-484
Kvaček, M.: Selenides from the deposits of Western Moravia, Czechoslovakia – Part II. Acta Universitatis Carolinae – Geologica, 1979, vol. 23, nos. 1-2, s. 15-38.
      • Žďár nad Sázavou
        • Rožná deposit
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Finland
 
  • Northern Finland Region
Econ Geol (1997) 92:468-484; Vuorelainen Y, Huhma A, Häkli A (1964): Sederholmite, wilkmanite, kullerudite, mäkinenite, and trüstedtite, five new nickel selenide minerals. Comptes Rendus de la Société Géologique de Finlande. 36, 113-125
vuorelainen, Y. & al. 1964. Sederholmite, wilkmanite, kullerudite, mäkinenite and trüstedtite, five new nickel-selenide minerals. C. R.Soc. Finlande, Vol. 63, p. 113-125.; Vuorelainen, Y. &al. 1964. Sederholmite, wilkmanite, kullerudite, mäkinenite and trüstedtite, five new nickel-selenide minerals. C. R. Soc. Géol. Finlande, Vol 63, p.113-125.
Germany
 
  • Bavaria
    • Upper Palatinate
      • Wölsendorf Fluorite Mining District
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
  • Lower Saxony
    • Harz
      • Lautenthal
pers. comm. Frank Keutsch (ID: SEM/EDS refl. light)
      • St Andreasberg District
        • St Andreasberg
Wittern: "Mineralfundorte in Deutschland", 2001
  • Saxony
    • Erzgebirge
      • Schlema-Hartenstein District
        • Alberoda
          • Shaft 366
The Canadian Mineralogist, V 42, 2004, pp. 1719-1732.
    • Oberlausitz
      • Niesky
        • Horscha
Witzke, T. & Giesler, T. (2007): Der Schieferabbau Pansberg bei Horscha in der Lausitz, Sachsen. Lapis 32 (7-8), 68-73; 86.
Kazakhstan
 
  • Almaty Province (Almaty Oblysy; Almati Oblast')
    • Middle Ili River
      • Dzharkenskaya Depression
Pavel M. Kartashov data
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Yeniseisk Autonomous Oblast'
Wanlie Ding (2005): World Nuclear Geoscience 22(2), 82-86
    • Tuva Republic
      • Turan District
DAN-SSSR,(1955) 105, 812-813; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Sweden
 
  • Östergötland
    • Valdemarsvik
Sandström, F. (2007): Skrikerum. Litiofilen 24 (1), 22-38
USA
 
  • Colorado
    • Dolores Co.
Minerals of Colorado (1997) Eckels, E. B.
    • Montrose Co.
Minerals of Colorado (1997) Eckels, E. B.
Minerals of Colorado (1997) Eckels, E. B.
Minerals of Colorado (1997) Eckels, E. B.
Minerals of Colorado (1997) Eckels, E. B.
Minerals of Colorado (1997) Eckels, E. B.
        • Paradox Valley
Minerals of Colorado (1997) Eckels, E. B.
Minerals of Colorado (1997) Eckels, E. B.; Am Min 53:2075-2077; Geochimica et Cosmochimica Acta Volume 16, Issue 4, July 1959, Pages 296-301
Minerals of Colorado (1997) Eckels, E. B.
Minerals of Colorado (1997) Eckels, E. B.
    • San Miguel Co.
      • Uravan District
Shawe, D.R., (2011), Uranium-vanadium deposits of the Slick Rock district, Colorado: U.S. Geological Survey Professional Paper 576-F, 80 p., 20 plates.
  • New Mexico
    • McKinley Co.
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
Northrop, Minerals of New Mexico, 3rd rev. ed, 1996
Austin, S.R., 1983, An investigation of sedimentary, mineralogical, chemical and color patterns and associations in the Rio de Oro mine, McKinley County, New Mexico: U.S. Department of Energy Report GJBX-30(83), 47 p.
NMBMMR Memoir 15 Geology and Technology of the Grants Uranium Region
Minerals of New Mexico 3rd ed.; Am Min 53:2075-2077
NMBMMR Memoir 15 Geology and Technology of the Grants Uranium Region
USGS Prof Paper 550C ppC133-C137
Econ Geol (1997) 92:468-484
NMBMMR Memoir 38 Geology and Technology of the Grants Uranium Region 1979
  • Utah
    • Emery Co.
      • San Rafael District (San Rafael Swell)
UGMS Bull 117 Minerals and Mineral Localities of Utah
Geochimica et Cosmochimica Acta Volume 16, Issue 4, July 1959, Pages 296-301
    • Grand Co.
      • Thompsons District (S. E. Thomsons)
        • Parco Mine Group
      • Yellow Cat District (W. part of Thompsons District)
        • Cisco
SEM-EDS and PXRD analyzed by Tony Kampf.
Collected by and in the collection of Brent Thorne.; Kasatkin, A.V., Plášil, J., Marty, J., Belakovskiy, D.I., Lykova, I.S. (2014): Nestolaite, CaSeO3·H2O, a new mineral from the Little Eva mine, Grand County, Utah, USA. Mineralogical Magazine, 78, 497-505.
Van King
    • San Juan Co.
      • Blanding
G. W. Robinson, V. King (1993) Whats New in Minerals. Mineralogical Record 24:381-395
  • Wyoming
    • Carbon Co.
Harshman, E. N. (1972) Geology and uranium deposits, Shirley Basin area, Wyoming. USGS Prof Paper 745
Harshman, E. N. (1972) Geology and uranium deposits, Shirley Basin area, Wyoming. USGS Prof Paper 745; USGS Prof Paper 550C ppC133-C137
    • Converse Co.
      • Southern Powder River Basin District
USGS Prof Paper 550C ppC133-C137
Mineral and/or Locality  
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