Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.98-2.503.95-4.10
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven
Cleavage
None
{110} Perfect, {110} Perfect, {110} Perfect
Mohs Hardness
5.5-6.53.5-4
2
10
👆🏻
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references