Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
1.98-2.503.90-4.00
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
None
Perfect on {001}, good on {210}, poor on {010}
Mohs Hardness
5.5-6.53-3.5
2
10
👆🏻
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references