Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-3.025.5
1
7.18
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Fracture
-
Conchoidal
Cleavage
Perfect
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
-99995-5.5
2
10
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Chemical Composition
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references