Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.79-3.943.05-3.21
1
7.18
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Fracture
Lamellar, Splintery
Uneven, Subconchoidal, Splintery
Cleavage
{100} Good, {001} Good, {010} Poor
Good on {110}, poor on {100}
Mohs Hardness
47.5
2
10
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Chemical Composition
FeAs
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references