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Sapphire
Sapphire
☒

Hexagonite
Hexagonite
☒



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Sapphire
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Hexagonite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
insoluble
-
3.95-4.03
Uneven
None, but may exhibit parting
9
Al 2 O 3
 
Brittle
-
-
2.98-3.03
Uneven
[110] perfect; [010] distinct
5-6
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.