Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.90-3.103.25-3.35
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Poor/indistinct on {1120} and {1011}
Perfect in three directions
Mohs Hardness
75
2
10
👆🏻
Chemical Composition
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references