Mineral - Bornite
Bornite
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
none
Formula
Cu₅FeS₄
Unit Cell
a=10.95 b=21.86 c=10.95 Z=16
Physical Properties
Hardness
3 - 3.5
Streak
blackgraygray black
Density
Heavy (3,5-6)
Cleavage
Indistinct
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
brown
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
orthorhombic-dipyramidal - 2/m 2/m 2/m
Space Group
Pbca (61)
Habit
coarse, Octahedron
Formation
In hydrothermal ore deposits; In the enrichment zone of supergene deposits; Secondary from Chalcopyrite
Paragenesis
Twinning
Penetration twins after {111]
Rarity
Common
Synonyms
Bornite
Composition
Elements
Mass
Cu
62.99
Pb
0.10
Fe
11.23
S
25.58
USA (Palache et al. 1952)