Physical Properties

Property Description
Sio2 99.5%>
Color Clear (in pure form)
Crystal Habit 6-side prism ending in 6-side pyramid (typical)
Crystal System Trigonal
Cleavage None
Fracture Conchoidal
Moh S Scale hardness 7-lower in impure varieties
Luster Vitreous
Refractive Index 1.544-1.553-Dr +0.009 (B-G Interval)
Streak White
Specific Gravity 2.65 constant Variable in impure varieties
Melting Point 1650c
Boiling Point 2230c
Solubility H2O Insoluble