Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.03-3.183.82-3.97
1
7.18
👆🏻
Fracture
Uneven, Irregular, Conchoidal
Subconchoidal, Conchoidal
Cleavage
{???} Indistinct
Perfect on [001] and [011]
Mohs Hardness
7-7.55.5-6
2
10
👆🏻
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references