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Minerals - Chalcocite | TerraCollect
Mineral - Chalcocite
Chalcocite
Cuâ‚‚S
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
none
Formula
Cuâ‚‚S
Unit Cell
a=15.25 b=11.88 c=13.49 β=116° Z=48
Physical Properties
Hardness
2.5 - 3
Streak
black
gray
gray black
Optical Properties
Color
black
gray
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Composition
Elements
Mass
Cu
79.67
Fe
0.14
S
20.16
USA (Palache et al. 1952)
Groups and Members
Chalcocite-Digenite-Group
Karten-Ebenen
Geologische Karte
Satelliten Karte
Density
Heavy (3,5-6)
Cleavage
Indistinct after {110}
Fracture
conchoidal
Tenacity
Brittle
monoclinic-prismatic - 2/m
Space Group
P2
1
/c (14)
Habit
massive,
prismatic,
tabular
Formation
In the cementation zone of supergene copper deposits, in hydrothermal veins
Paragenesis
Twinning
Pseudohexagonal rotational twins after {110}; Cross-shaped interpenetrational twins after {032}
Rarity
Common
Synonyms
Chalcocite
