Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.98-2.502.98-3.10
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven, Conchoidal
Cleavage
None
{100} Perfect, {110} Good, {011} Distinct
Mohs Hardness
5.5-6.55.5-6
2
10
👆🏻
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references