Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.103.87-4.14
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Subconchoidal, Conchoidal
Cleavage
Poor/indistinct on {1120} and {1011}
Poor on {120}, in traces on {001}
Mohs Hardness
75.5-6
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
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references