Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.58-2.802.90-2.98
1
7.18
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Fracture
Uneven, Irregular
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
5.57.5-8
2
10
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Chemical Composition
(Mg,Fe2+ ) 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references