Chemical Formula
SiO2
Color
Brown, Black
Hardness
7
Crystal System
Hexagonal
Refractive Index
1.54 - 1.55
SG
2.63 - 2.65
Transparency
Transparent to translucent
Double Refraction
.009
Luster
Vitreous
Cleavage
Indiscernible
Mineral Class
Quartz
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