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Blue spinel
Blue spinel
☒

Papagoite
Papagoite
☒



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Blue spinel
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Papagoite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
-9999
-
None
-9999
MgAl2O4
 
-
-
-
3.25
-
Imperfect in one direction
5-5.5
CaCuAlSi 2O 6(OH) 3Michael O’Donoghue , Gems, Sixth Edition (2006)