Mineral - Cobaltite
Cobaltite
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
middle
Formula
CoAsS
Unit Cell
a=5.583 b=5.589 c=5.581 Z=4
Physical Properties
Hardness
5.5
Streak
blackgraygray black
Density
Very Heavy (>6)
Cleavage
Perfect after {001}
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
graysilver
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
orthorhombic-pyramidal - mm2
Space Group
Pca2 1 (29)
Habit
Deltoidal icositetrahedron, dodecahedron, Cube
Formation
hydrothermal, Metasomatism
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Cobaltite
Composition
Elements
Mass
Co
28.64
Fe
4.11
Ni
3.06
As
44.77
S
19.34
Canada (Palache et al. 1952)
Groups and Members
Cobaltite-Group