Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.55.5
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
5.5-65-5.5
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 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