Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.58-2.805.5
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
{001} Good
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
5-5.55-5.5
2
10
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Chemical Composition
(Mg,Fe2+ ) 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references