Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.13-3.755.5
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
Conchoidal
Cleavage
Poor on {100}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
65-5.5
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 9(SiO 4) 4(F,OH)) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references