Mineral - Zinkenite
Zinkenite
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
middle
Formula
Pb₉Sb₂₂S₄₂
Unit Cell
a=44.15 c=8.62 Z=12
Physical Properties
Hardness
3 - 3.5
Streak
blackgraygray black
Density
Heavy (3,5-6)
Cleavage
Indistinct after {11 2 0}
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
blackgray
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
hexagonal
Point Group
hexagonal-pyramidal - 6
Space Group
P6 3 (173)
Habit
acicular, prismatic, radial
Formation
Primary hydrothermal processes in low- to medium-temperature lead-antimony vein deposits
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Zinkenite
Composition
Elements
Mass
Pb
34.33
Cu
0.70
Fe
0.06
Sb
42.15
S
22.63
Germany (Palache et al. 1952)