Tenacity
Flexible
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.20-2.405.5
1
7.18
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Fracture
Conchoidal, Splintery, Fibrous
Conchoidal
Cleavage
Perfect on {010}, distinct on {100}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
25-5.5
2
10
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Chemical Composition
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references