Mineral Information and Data:

Baumstarkite
Ag3Sb3S6 [CNMNC approved formula]

Named for Manfred Baumstark(1954-), German mineralogist who first recognized the mineral.

IMA status : Approved Species 2002 (IMA1999-049)
CLASSIFICATION 
Dana
(8th edition) :
03.07.04.02  
  (03) Sulfides - Sulfosalts
  (03.07) where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.04)
  
Nickel-Strunz
(10th edition) :
02.HA.25
  (02) Sulfides
  (02.H) Sulfosalts of SnS Archetype
  (02.HA) With Cu, Ag, Fe (without Pb)
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Space group: A = 7.766Å, b = 8.322Å, c = 8.814Å; α = 100.62°, β = 104.03°, γ = 90.22°
Unit cell: P
Crystal Habit: Equant crystals, to 3 mm, showing {001}, {101}, {201}, {010}, {011}, {100}.
Twinning: Common on {001}
  
Color: Iron-black, grayish black on fresh surfaces; deep blood-red in transmitted light, may show red internal reflections; gray to white in reflected light
Diaphaneity: Opaque, transparent on thin edges
Luster: Metallic
Hardness (Mohs): ~2.5
Measured Density: 5.33 g/cm3
Cleavage: Perfect on {001}; less perfect on {100}
Tenacity: Sectile, somewhat flexible
Fracture: Even
Streak: Grayish black
  
Polymorphism and Series: Trimorphous with cuboargyrite and miargyrite.
Geologic Setting: Of hydrothermal hypogene origin.
Mineral Association: Miargyrite, pyrargyrite, stannite, kesterite, andorite, diaphorite, robinsonite, galena, chalcopyrite, sphalerite, pyrite.
  

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