General Information:
Chemical Formula:Sb2S2O
Composition:(Molecular Weight = 323.63 gm)Antimony 75.24 %
SbSulfur 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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