Tenacity
-
Slightly sectile
Solubility
-
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
Durability
-
-
Specific Gravity
4.392
1
7.18
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Fracture
Uneven
Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Prismatic {10 1 0}, perfect
Mohs Hardness
7.5-82-2.5
2
10
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Chemical Composition
Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references