Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.98-2.503.52
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
-
Cleavage
None
{100} Perfect, {001} Perfect
Mohs Hardness
5.5-6.55-5.5
2
10
👆🏻
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Na(Mn2+ ,Ca) 2Si 3O 8(OH)Michael OâDonoghue , Gems, Sixth Edition (2006)