Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.002.60-2.65
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Uneven, Conchoidal
Cleavage
None
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
5-5.56-6.5
2
10
👆🏻
Chemical Composition
CaBSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)