Tenacity
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Mohs Hardness
Chemical Composition
(Mg,Fe)Al 2O 4Gemdat.org , Management Team (2012)
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
Prismatic {10 1 0}, perfect
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references