Mineral - Carrollit
Carrollit
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
none
Formula
Cu(Co,Ni)₂S₄
Unit Cell
a=9.46 Z=8
Physical Properties
Hardness
5
Streak
blackgraygray black
Density
Heavy (3,5-6)
Cleavage
Indistinct after {001}
Fracture
conchoidal,
uneven
Tenacity
Brittle
Optical Properties
Color
gray
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
isometric
Point Group
hexoctahedral - 4/m 3 2/m
Space Group
Fd 3 m (227)
Habit
Octahedron, Cube
Formation
In hydrothermal ore deposits of stratiform sedimentary deposits, under reducing conditions
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Carrollit
Composition
Elements
Mass
Cu
20.20
Co
38.60
Ni
0.30
Fe
0.60
S
41.20
DR Congo (Palache et al. 1952)
Groups and Members
Spinel-Supergroup
Thiospinel-Group
Carrollite-Subgroup