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Prase
Prase
☒

Sulphur
Sulphur
☒



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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.64-2.69
-
None
7
SiO 2Michael O’Donoghue , Gems, Sixth Edition (2006)
 
-
-
-
2.05-2.08
-
None
-9999
SWalter Schumann , Gemstones of the world (2001)