Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-3.023.05-3.21
1
7.18
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Fracture
-
Uneven, Subconchoidal, Splintery
Cleavage
Perfect
Good on {110}, poor on {100}
Mohs Hardness
-99997.5
2
10
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Chemical Composition
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references