Silver Sulfide monoclinic type
Ag2S
Chemical name
Silver Sulfide monoclinic type
Mineral name
Acanthite
Chemical formula
Ag2S
Melting point [°C]
825
Crystal system
monoclinic
Crystal Class
monoclinic-prismatic (2/m)
Space Group
P2_1/n
Unit cell
a [Å]:4.23
b [Å]:6.93
c [Å]:7.86
Molecular weight [g/mol]
247,8
Formula units
Z=4
Twinning
polysynthetic twins on {111}
Mohs hardness
2.0 - 2.5
Density [g/cm3]
7.3
Cleavage
indistinct
Fracture / Tenacity
uneven
Color
iron-black
Streak
black
Transparency
opaque