Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.642.69-2.79
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Conchoidal
Cleavage
Absent
Poor on {0001}
Mohs Hardness
6.5-75.5-6.5
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references