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Sinhalite
Sinhalite
☒

Black Opal
Black Opal
☒



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Sinhalite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.46-3.50
Conchoidal
Perfect
6-7
MgAlBO 4Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
 
-
-
-
1.97-2.22
Conchoidal
None
6-6.5
SiO 2 + H 2OUlrich Henn and Claudio C.

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