Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.03-3.182.60-2.65
1
7.18
👆🏻
Fracture
Uneven, Irregular, Conchoidal
Uneven, Conchoidal
Cleavage
{???} Indistinct
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
7-7.56-6.5
2
10
👆🏻
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)