Tenacity
-
-
Solubility
-
Insoluble in acids
Durability
-
-
Specific Gravity
2.54-2.784.20-4.30
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
Good in three directions
{110} good, 100 moderate, parting on {092} and {011}
Mohs Hardness
5-66-6.5
2
10
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Chemical Composition
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)