Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.105.5
1
7.18
👆🏻
Fracture
Splintery, Granular
Conchoidal
Cleavage
None
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
6-6.55-5.5
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references