Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.55.00-5.30
1
7.18
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Fracture
Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
5-5.56
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe 2O 3Arthur Thomas , Gemstones (2009)