General Information:
Chemical Formula:
FeSb2S4
Composition:
(Molecular Weight = 427.61 gm)
Iron 13.06 % Fe
Antimony 56.94 % Sb
Sulfur 30.00 % S
Empirical Formula:
Fe2+Sb2S4
Locality:
Pontgibaud, Puy-de-Dome, France.
Name Origin:
Named after the French chemist, P. Berthier (1782-1861).
Physical Properties:
Cleavage:
[010] Good
Color:
dark steel gray or dark brownish gray.
Density:
4 - 4.6, Average = 4.3
Diaphaniety:
Opaque
Habits:
Fibrous - Crystals made up of fibers., Massive - Uniformly indistinguishable crystals forming large masses., Acicular - Occurs as needle-like crystals.
Hardness:
2-2.5 - Gypsum-Finger Nail
Luminescence:
None.
Luster:
Metallic
Streak:
brownish gray
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