Chalcosine
Cu2S
Chemical name
Chalcosine
Mineral name
Chalcosine
Chemical formula
Cu2S
Crystal system
monoclinic
Space Group
P21/c (Nr. 14)
Unit cell
a [Å]:15,25
b [Å]:11,88
c [Å]:13,49 β = 116,3°
Formula units
Z = 48
Mohs hardness
2,5 - 3
Density [g/cm3]
5,5 - 5,8
Cleavage
{110}, {010}, {001}, {111}, {112}, {113}, {023}
Color
lead gray, steel gray, matt black
Streak
dark gray
Transparency
opaque