Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.90-3.106.86-7.03
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Poor/indistinct on {1120} and {1011}
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
76-7
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
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references