Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.03-3.183.08-3.12
1
7.18
👆🏻
Fracture
Uneven, Irregular, Conchoidal
ConchoidalWalter Schumann
Cleavage
{???} Indistinct
{010} Perfect
Mohs Hardness
7-7.57.5
2
10
👆🏻
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references