Tenacity
-
-
Solubility
Insoluble in acids
-
Durability
-
-
Specific Gravity
4.20-4.302.54-2.78
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
{110} good, 100 moderate, parting on {092} and {011}
Good in three directions
Mohs Hardness
6-6.55-6
2
10
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Chemical Composition
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references