Mineral - Baumhauerite
Baumhauerite
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
middle
Formula
Pb₁₂As₁₆S₃₆
Unit Cell
a=22.80 b=8.36 c=7.89 α=90° β=97° γ=90° Z=4
Physical Properties
Hardness
3
Streak
brown
Density
Heavy (3,5-6)
Cleavage
Perfect after {100}
Fracture
conchoidal
Tenacity
Brittle
Optical Properties
Color
blackgraysilver
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
triclinic-pinacoidal - 1
Space Group
P 1 (2)
Habit
prismatic, tabular
Formation
In hydrothermal ore deposits
Paragenesis
Twinning
Polysynthetic twins after {100}
Rarity
Rarely
Synonyms
Baumhauerite
Composition
Elements
Mass
Pb
47.90
Tl
0.40
As
27.20
Sb
0.60
S
23.90
Switzerland (Palache et al. 1952)
Groups and Members
Sartorit-Group