Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.103.05-3.21
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Uneven, Subconchoidal, Splintery
Cleavage
Poor/indistinct on {1120} and {1011}
Good on {110}, poor on {100}
Mohs Hardness
77.5
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
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references