Tenacity
Brittle
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.98-3.033.25-3.35
1
7.18
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Fracture
Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
[110] perfect; [010] distinct
Perfect in three directions
Mohs Hardness
5-65
2
10
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Chemical Composition
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references