Mineral Information and Data:

Argentopentlandite
Ag(Fe,Ni)8S8 [CNMNC approved formula]

Named for its silver content and similarity in composition to pentlandite.

IMA status : Approved Species 1977 (IMA1970-047)
CLASSIFICATION 
Dana
(8th edition) :
02.07.01.02  
  (02) Sulfides - Including Selenides and Tellurides
  (02.07) where Am Bn Xp, with (m+n):p=9:8
  (02.07.01) Pentalndite Group (Isometric: Fm3m)
  
Nickel-Strunz
(10th edition) :
02.BB.15a
  (02) Sulfides
  (02.B) Metal Sulfides, M:S > 1:1 (mainly 2:1)
  (02.BB) With Ni, Fe
  
Crystal system: Cubic System
Point group (H-M): m3m (or 4/m 3 2/m) — hexoctahedral
Unit cell: a = 10.521 Å
Crystal Habit: Euhedral crystals with well developed octahedral faces; massive
  
Color: Bronze-brown
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 3 to 3.5
Measured Density: 4.66 (calculated) g/cm3
Cleavage: 1; Well developed on {111}
Streak: Reddish brown
  
Geologic Setting: In pyrite and cubanite-chalcopyrite hydrothermal veins in ultramafic rocks and in skarn; in hydrothermal veins in acidic volcanics; rare in carbonatites.
Mineral Association: Pyrite, pyrrhotite, mackinawite, cubanite, chalcopyrite, stannite, galena, sphalerite, calcite, quartz
  
Synonyms/varieties: IMA1970-047

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