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Achavalite

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Formula:
(Fe,Cu)Se
System:HexagonalColour:dark grey
Lustre:MetallicHardness:
Member of:Nickeline Group
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

IMA status: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)
Strunz 8th edition ID:2/C.19-60
Strunz 9th edition ID:2.CC.05
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.
Hey's CIM Ref.: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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Type Occurrence of Achavalite

Type Locality:Cacheuta Mine, Cerro de Cacheuta, Sierra de Cacheuta, Mendoza, Argentina
Year of Discovery:1939
Geological Setting of type material:selenide deposit

Physical Properties of Achavalite

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

Relationship of Achavalite to other Species

Member of:Nickeline Group
Other Members of Group:

- +
Related Minerals - Nickel-Strunz Grouping):

- +
2.CC.UM2007-26-S:CuFeIrNiPtRh
(Ir,Cu,Ni,Pt,Rh,Fe)
 
9
S
 
11
2.CC.05Breithauptite
NiSb
2.CC.05Freboldite
CoSe
2.CC.05Kotulskite
Pd(Te,Bi)
2.CC.05Langisite
(Co,Ni)As
2.CC.05Nickeline
NiAs
2.CC.05Sederholmite
beta-NiSe
2.CC.05Sobolevskite
Pd(Bi,Te)
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
(Pd,Ni)(Sb,Te)
2.CC.30Vavřínite
Ni
 
2
SbTe
 
2
2.CC.35aBraggite
(Pt,Pd,Ni)S
2.CC.35bCooperite
PtS
2.CC.35aVysotskite
(Pd,Ni)S
Related Minerals - Hey's Index Grouping:

- +
3.9.1Pyrrhotite
Fe
 
1-x
S (x = 0 to 0.17)
3.9.3Pyrite
FeS
 
2
3.9.4Marcasite
FeS
 
2
3.9.5Greigite
Fe
2+
 
Fe
3+
2
S
 
4
3.9.6Mackinawite
(Fe,Ni)
 
9
S
 
8
3.9.7Smythite
(Fe,Ni)
 
3+x
S
 
4
(x=0-0.3)
3.9.9Ferroselite
FeSe
 
2
3.9.10Frohbergite
FeTe
 
2
3.9.11Löllingite
FeAs
 
2
3.9.12Arsenopyrite
FeAsS
3.9.13Gudmundite
FeSbS

Other Names for Achavalite

Other Languages:
German:Achavalit
Russian:Ачавалит
Simplified Chinese:硒铁矿
Spanish:Achavalita

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 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

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  • Raman and XRD data at RRUFF project
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  • Localities for Achavalite

    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.
    (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.
    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
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