Mineral Information and Data:

Achavalite
FeSe [CNMNC approved formula]

Named for L. Achaval.

IMA status : Valid species (Pre-IMA 1939) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
02.08.11.11  
  (02) Sulfides - Including Selenides and Tellurides
  (02.08) where Am Bn Xp, with (m+n):p=1:1
  (02.08.11) Nickeline Group (Hexagonal: P63/mmc)
  
Nickel-Strunz
(10th edition) :
02.CC.05
  (02) Sulfides
  (02.C) Metal Sulfides, M:S = 1:1 (and similar)
  (02.CC) With Zn, Fe, Cu, Ag, etc.
  
Crystal system: Hexagonal System
Point group (H-M): 6/mmm (or 6/m 2/m 2/m) — dihexagonal-dipyramidal
Unit cell: a = 3.636 Å, c = 5.946 Å, α = 90°, β = 120°
  
Color: Gray
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 2.5
  
Geologic Setting: In selenide deposits (Cacheuta Mine, Cerro de Cacheuta, Sierra de Cacheuta, Mendoza, Argentina)
  
Comments: 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)

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