Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.6-3.35.5
1
7.18
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Fracture
Lamellar
Conchoidal
Cleavage
Perfect 001
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
2-2.55-5.5
2
10
👆🏻
Chemical Composition
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references