Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.97-2.221.65-1.99
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
None
{010} Perfect, {110} Perfect
Mohs Hardness
6-6.52-2.5
2
10
👆🏻
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001) More from other references
NaCaB 5O 6(OH) 6 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)