General Information:
Chemical Formula:
Sb2S2O
Composition:
(Molecular Weight = 323.63 gm)
Antimony 75.24 % Sb
Sulfur 19.82 % S
Oxygen 4.94 % O
Empirical Formula:
Sb2S2O
Name Origin:
Name from kermes, a name given from the Persian qurmizq, "crimson" in the older chemistry to red amorphous antimony trisulphide, often mixed with antimony trioxide.
Physical Properties:
Cleavage:
[100] Perfect
Color:
violet red, cherry red, or red.
Density:
4.5 - 4.6, Average = 4.55
Diaphaniety:
Translucent to Opaque
Habits:
Fibrous - Crystals made up of fibers., Acicular - Occurs as needle-like crystals., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
None.
Luster:
Adamantine
Streak:
brownish red
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