Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.85-6.153.65-4.55
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Fair in four directions forming octahedrons
None, but may exhibit slight parting
Mohs Hardness
3.5-47.5-8
2
10
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Chemical Composition
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)