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Minerals - Stannite | TerraCollect
Mineral - Stannite
Stannite
Cuâ‚‚FeSnSâ‚„
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
low
Formula
Cuâ‚‚FeSnSâ‚„
Unit Cell
a=5.44 c=10.73 Z=2
Physical Properties
Hardness
4
Streak
black
Density
Heavy (3,5-6)
Optical Properties
Color
black
gray
bronze
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
tetragonal
Composition
Elements
Mass
Cu
29.24
Fe
13.95
Zn
0.08
Sn
27.14
S
28.88
Bolivia (Palache et al. 1952)
Groups and Members
Stannite-Group
Cleavage
Indistinct after {110} and {001}
Fracture
uneven
Tenacity
Brittle
Point Group
tetragonal-scalenohedral -
4
2m
Space Group
I
4
2m (121)
Habit
coarse,
dipyramidal,
massive,
prismatic,
pyramidal,
Tetrahedron
Formation
(1) Primary magmatic formation in high-temperature, hydrothermal tin-tungsten-quartz veins and in pneumatolytic greisen deposits (2) In volcanic-exhalative, sulfide deposits (VMS) through hydrothermal precipitation at moderate temperatures.
Paragenesis
Twinning
Penetration twins after {102}
Rarity
Rarely
Synonyms
Stannite
