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Sardonyx
Sardonyx

Sanidine
Sanidine



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Sardonyx
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.55-2.70
-
None
6.5-7
SiO 2Ulrich Henn and Claudio C.
 
-
-
-
2.54-2.61
Uneven
{001} Perfect, {010} Good
6
KAlSi 3O 8Michael O’Donoghue , Gems, Sixth Edition (2006)