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Hardystonite
Hardystonite
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Sardonyx
Sardonyx
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
-
-
3.396-3.443
-
[001] good, [100] and [110] fair
3-4
Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)
 
-
-
-
2.55-2.70
-
None
6.5-7
SiO 2Ulrich Henn and Claudio C.

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