Tenacity
Brittle
-
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
2.653.62-3.87
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
3,1
None
Mohs Hardness
77-7.5
2
10
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Chemical Composition
SiO 2Ulrich Henn and Claudio C.
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)