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Achavalite

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Formula:
(Fe,Cu)Se
System:
Hexagonal
Colour:
dark grey
Lustre:
Metallic
Hardness:
Member of:
Name:
Named after L. Achaval
Never adequately described, in need of modern reinvestigation.
Massive granular.

A phase "Fe(Se,S)" is reported by Yakovleva et al. (2001).

Classification of Achavalite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Explanation of status:
Grandfathered, but never adequately described. Attempts to find more material at Cacheuta for further study have been unsuccessful. (Brodtkorb (2002): Las Especies Minerales de la Republica Argentina)
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.
3.9.8

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 Achavalite

Year of Discovery:
1939
Geological Setting of First Recorded Material:
selenide deposit

Physical Properties of Achavalite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
dark grey
Streak:
grey-black
Hardness (Mohs):

Crystallography of Achavalite

Crystal System:
Hexagonal

Chemical Properties of Achavalite

Formula:
(Fe,Cu)Se
Essential elements:
All elements listed in formula:
Analytical Data:
Fe and Se were the only elements detectable by blowpipe. Quantitative analyses not recorded.

Relationship of Achavalite to other Species

Member of:
Other Members of Group:
2.CC.UM2007-26-S:CuFeIrNiPtRh(Ir,Cu,Ni,Pt,Rh,Fe)9S11
2.CC.05BreithauptiteNiSb
2.CC.05FrebolditeCoSe
2.CC.05KotulskitePd(Te,Bi)
2.CC.05Langisite(Co,Ni)As
2.CC.05NickelineNiAs
2.CC.05Sederholmitebeta-NiSe
2.CC.05SobolevskitePd(Bi,Te)
2.CC.05StumpflitePt(Sb,Bi)
2.CC.05Sudburyite(Pd,Ni)Sb
2.CC.05JaipuriteCoS
2.CC.05ZlatogoriteNiCuSb2
2.CC.10PyrrhotiteFe1-xS (x = 0 to 0.17)
2.CC.10Smythite(Fe,Ni)3+xS4 (x=0-0.3)
2.CC.10TroiliteFeS
2.CC.15CherepanoviteRhAs
2.CC.15Modderite(Co,Fe)As
2.CC.15Ruthenarsenite(Ru,Ni)As
2.CC.15Westerveldite(Fe,Ni,Co)As
2.CC.20MilleriteNiS
2.CC.20Mäkineniteγ-NiSe
2.CC.20UM1990-38-S:CuFeIrNiPtRh(Ir,Pt,Ni,Fe)S
2.CC.25Mackinawite(Fe,Ni)9S8
2.CC.30Hexatestibiopanickelite(Pd,Ni)(Sb,Te)
2.CC.30VavříniteNi2SbTe2
2.CC.35aBraggite(Pt,Pd,Ni)S
2.CC.35bCooperitePtS
2.CC.35aVysotskite(Pd,Ni)S
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)
3.9.9FerroseliteFeSe2
3.9.10FrohbergiteFeTe2
3.9.11LöllingiteFeAs2
3.9.12ArsenopyriteFeAsS
3.9.13GudmunditeFeSbS

Other Names for Achavalite

Name in Other Languages:
German:Achavalit
Simplified Chinese:硒铁矿
Spanish:Achavalita

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 Achavalite

Reference List:
Bol. Fac. Cienc. Univ. Cordoba 2/3-4 (1939), 72.

Min. Abs. (1953), 12, 236

Bernardini, Gian Piero; Mazzetti, Giuseppe (1979) Phase relations in the copper-iron-selenium system at 900 and 700C. Rendiconti della Societa Italiana di Mineralogia e Petrologia 35, 71-90.

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.

Strunz & Nickel (2001) Strunz Mineralogical Tables

Yakovleva, V. A.; Nesterov, A. R.; Belogub, E. V.; Novoselov, K. A. (2001): Secondary sulfides, selenides and arsenides in the supergene zone of Zapadno-Ozernoe massive sulfide deposit, South Urals. Vestnik Sankt-Peterburgskogo Universiteta, Seriya 7: Geologiya, Geografiya 2001 (3), 73-79 (in Russian).

Brodtkorb (2002) Las Especies Minerales de la Republica Argentina

Internet Links for Achavalite

Localities for Achavalite

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
 
  • Mendoza
Econ Geol (1997) 92:468-484
      • Cerro de Cacheuta
[Clark, 1993 - "Hey's Mineral Index, 3rd Edition"]; Ahlfeld Friedrich and Angelelll Vlctorio 1948 Las especies minerales de la Republica Argentina Univ Nac Tucumftn Inst Geologla y Mineria Jujuy Pub no 458 p 47 48 49 50 54 67 69 70 71 120 121 133 134
China
 
  • Hubei Province
    • Enshi Autonomous Prefecture (E'xi Autonomous Prefecture)
      • Enshi Co.
Handong Qian, Zhenghua Zhao, Xiang Zheng, Chengyi Lin, Jiahu Zeng, Xuemei Wu, and Wu Chen (2006): Acta Geologica Sinica 80(11), 1706-1710
Mineral and/or Locality  
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