Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.43-3.442.90-2.98
1
7.18
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Fracture
-
Conchoidal, ConchoidalWalter Schumann
Cleavage
None Observed
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
6.5-77.5-8
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references