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Forsterite
Forsterite

Rhyolite
Rhyolite



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Forsterite
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Rhyolite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
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-
-
3.23-3.26
Conchoidal
Perfect on {010} imperfect on {100}
6.5-7
Mg 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)
 
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-9999
-
None
7
70% SiO2, Al2O3, Na2O, K2O