Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.19-3.562.54-2.78
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
{110} Perfect, {010} Indistinct
Good in three directions
Mohs Hardness
5.5-65-6
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references