Information
Specific Gravity: 2.60 ( -0.05 / +0.10 )
Hardness: 6.5 - 7.0
Refractive Index: 1.530 - 1.540
Birefringence: Usually Not Detectable
Crystal System: Trigonal
Luster: Dull To Waxy
Chemical Composition: SiO₂
Optical Character: Aggregate
Pleochroism: None
Transparency: Translucent
Color: All colors.
Remark: Aggregate