Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.915.5
1
7.18
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Fracture
Subconchoidal, Conchoidal
Conchoidal
Cleavage
Indistinct
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
3.55-5.5
2
10
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Chemical Composition
Ca 6Si 2(CO 3) 2(SO 4) 2(OH) 12 · 24H 2OUlrich Henn and Claudio C.
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references