Kermesite

Kermesite or antimony oxysulfide is also known as red antimony (Sb2S2O) . The name kermesite is a name derived from the Persian qurmizq, which later became "crimson" and was given to the mineral’s color which ranges from cherry red to a deep red bordering on black. Kermesite is the result of partial oxidation between stibnite (Sb2S3) and other antimony oxides such as valentinite (Sb2O3) or stibiconite (Sb3O6(OH)). Under certain conditions with oxygenated fluids the transformation of all sulfur to oxygen would occur but kermesite occurs when that transformation is halted.
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n. kermesite

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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kermesite
danh từ (khoáng chất) khoáng chất màu đỏ; keemezit
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