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Boracite
Boracite
☒

Peridot
Peridot
☒



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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
Soluble
-
2.95-2.96
Conchoidal
None
7-7.5
Mg 3B 7O 13ClMichael O’Donoghue , Gems, Sixth Edition (2006) More from other references
 
-
-
-
1.54-1.55
Conchoidal
Poor
6.5-7
(Mg,Fe)2SiO4