Tenacity
Brittle
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.14-3.163.25-3.35
1
7.18
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Fracture
Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect on {010} and {110}
Perfect in three directions
Mohs Hardness
5-5.55
2
10
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Chemical Composition
MgF 2Ulrich Henn and Claudio C.
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references