Mineral Information and Data:

Argentotennantite
Ag6Cu4(Fe,Zn)2As4S13 [CNMNC approved formula]

Named for the chemical composition and by analogy to tennantite.

IMA status : Approved Species 1986 (IMA1985-026)
CLASSIFICATION 
Dana
(8th edition) :
03.03.06.07  
  (03) Sulfides - Sulfosalts
  (03.03) where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.03.06) Tetrahedrite Group (Isometric: I-43m)
  
Nickel-Strunz
(10th edition) :
02.GB.05
  (02) Sulfides
  (02.G) Sulfarsenites, sulfantimonites, sulfbismuthites
  (02.GB) Neso-sulfarsenites, etc. with additional S
  
Crystal system: Cubic System
Point group (H-M): 43m (or 4 3m) — hextetrahedral
Unit cell: a = 10.584 Å
Crystal Habit: Small grains to 0.1 mm
  
Color: Gray-black
Diaphaneity: Opaque
Luster: Resinous
Hardness (Mohs): 3.4
Measured Density: 5.05 (calculated) g/cm3
Fracture: Conchoidal
Streak: Red-brown to black
  
Polymorphism and Series: Forms a series with freibergite.
Geologic Setting: In a polymetallic deposit (Kvartsitoviye Gorki deposit, Kazakhstan); in a stratiform Pb–Zn orebody (Silvermines, Ireland).
Mineral Association: Tennantite–tetrahedrite, freibergite, stibnite, mercurian gold, pyrite, galena, siderite, ankerite, quartz (Kvartsitoviye Gorki deposit, Kazakhstan); geocronite, proustite–pyrargyrite, galena (Silvermines, Ireland)
  

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