Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.65-4.555.85-6.15
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
None, but may exhibit slight parting
Fair in four directions forming octahedrons
Mohs Hardness
7.5-83.5-4
2
10
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Chemical Composition
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references