Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
1.98-2.505.9-6.3
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Conchoidal, Uneven
Cleavage
None
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
5.5-6.54.5-5
2
10
👆🏻
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references