Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.82-4.005.5
1
7.18
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Fracture
-
Conchoidal
Cleavage
{???} Indistinct
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
5.55-5.5
2
10
👆🏻
Chemical Composition
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references