Mineral - Jamesonit
Jamesonit
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
none
Formula
FePb₄Sb₆S₁₄
Unit Cell
a=15.57 b=18.98 c=4.03 β=92° Z=2
Physical Properties
Hardness
2.5
Streak
blackgraygray black
Density
Heavy (3,5-6)
Cleavage
Distinct after {001}
Fracture
Tenacity
Brittle
Optical Properties
Color
blackgray
Birefringence
Luster
Metallic,
Silky
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-prismatic - 2/m
Space Group
P2 1 /c (14)
Habit
fibrous, felted, acicular, prismatic, prismatic
Formation
Primary hydrothermal in lead-antimony sulfide veins
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Jamesonit
Composition
Elements
Mass
Pb
40.14
Fe
2.64
Cu
0.18
Sb
34.25
S
22.34
England (Palache et al. 1952)