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Dominant species
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Kermesite
Chemical
Formula
(Sb2S2O)
Species
Sulfides
Crystal
System
Triclinic
Mohs
Scale
1
Specific
Gravity
4.5-4.8
Color
Red to cherry red
Streak
Brownish red
Luster
Adamantine
Refractive
Index
n = 2.720 n = 2.740 n = 2.740
Diaphaneity
Translucent, Opaque
Cleavage
PerfectPerfect on the
Fracture
Brittle
Crystal Habit:Acicular, fibrous, radial
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