Bornite

Cu5FeS4

Bornite - Cu5FeS4
Chemical name
Bornite
Mineral name
Peacock Ore
Chemical formula
Cu5FeS4
Crystal Class
Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Space Group
Pbca
(Pseudo cubic at roomtemp.)
(Cubic at > 228° A=5.50Å)
Unit cell
a [Å]:10.95
b [Å]:21.862
c [Å]:10.95
Molecular weight [g/mol]
501.88
Formula units
Z=16
Twinning
Penetration twins on [111]
Mohs hardness
3 - 3.25
Density [g/cm3]
5.06 - 5.09
Cleavage
Poor on [111]
Fracture / Tenacity
Brittle
Color
Copper red, bronze brown, purple
Streak
Grayish black
Luster
Metallic if fresh, iridescent tarnish
Refractive Index
Opaque