Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.65-4.553.25-3.35
1
7.18
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Fracture
Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
None, but may exhibit slight parting
Perfect in three directions
Mohs Hardness
7.5-85
2
10
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Chemical Composition
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references