Tenacity
Elastic
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.78-2.885.5
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
Perfect on the {001}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
2-35-5.5
2
10
👆🏻
Chemical Composition
KAl 2AlSi 3O 10(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