Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.65-4.556.30-6.39
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
None, but may exhibit slight parting
[001] good, [210] distinct
Mohs Hardness
7.5-83-3.5
2
10
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Chemical Composition
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references