Mineral Information and Data:

Aschamalmite
Pb6-3xBi2+xS9 [CNMNC approved formula]

Named for the locality: Ascham Alm, Untersulzbachtal, Austria.

IMA status : Approved Species 1983 (IMA1982-089)
CLASSIFICATION 
Dana
(8th edition) :
03.01.11.01  
  (03) Sulfides - Sulfosalts
  (03.01) where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.01.11)
  
Nickel-Strunz
(10th edition) :
02.JB.40b
  (02) Sulfides
  (02.J) Sulfosalts of PbS Archetype
  (02.JB) Galena derivatives, with Pb
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 13.719(1) Å, b = 4.132(1) Å, c = 31.419(3) Å β = 90.94(1)°
Crystal Habit: As prismatic, lathlike crystals, to 5 cm; also as thick, slightly bent plates.
  
Color: Lead-gray; creamy white in reflected light
Diaphaneity: Opaque
Luster: Metallic
Measured Density: 7.33 (calculated) g/cm3
Cleavage: Perfect on {001}
  
Geologic Setting: In alpine veins, cutting gneiss.
Mineral Association: Cosalite, galena, quartz, albite, orthoclase, calcite, chlorite.
  

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