Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.655.50-5.90
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
3,1
On {10 1 0}, perfect; parting on {000 1 }
Mohs Hardness
74
2
10
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Chemical Composition
SiO 2Ulrich Henn and Claudio C.
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)