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Blue spinel
Blue spinel
☒

Adamite
Adamite
☒



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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
-9999
-
None
-9999
MgAl2O4
 
Brittle
-
-
4.32-4.48
Uneven, Subconchoidal, Conchoidal
{101}, good; {010}, poor
3.5
Zn 2(AsO 4)(OH)Michael O’Donoghue , Gems, Sixth edition (2006)

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