Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.08-3.123.23-3.26
1
7.18
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Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
{010} Perfect
Perfect on {010} imperfect on {100}
Mohs Hardness
7.56.5-7
2
10
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Chemical Composition
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Mg 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)