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Dominant species
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Pigeonite
Chemical
Formula
(Ca,Mg,Fe)(Mg,Fe)Si2O6
Species
Silicates
Crystal
System
Monoclinic
Mohs
Scale
6
Specific
Gravity
3.17-3.46
Color
Brown, greenish brown-black
Streak
Grey white
Luster
Vitreous, Dull
Refractive
Index
n = 1.683 - 1.722 n = 1.684 - 1.722 n = 1.704 - 1.752
Diaphaneity
Semitransparent
Cleavage
Distinct/Good
Fracture
Conchoidal
Crystal Habit:Prismatic crystals, to 1 cm; granular, massive.
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