Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.642.34-2.51
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
-
Cleavage
Absent
None
Mohs Hardness
6.5-7-9999
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O