Tenacity
-
-
Solubility
insoluble in common solvents
-
Durability
-
-
Specific Gravity
2.652.24-2.29
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Uneven, Subconchoidal, Conchoidal
Cleavage
Indiscernible
Very poor [100]
Mohs Hardness
75-5.5
2
10
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Chemical Composition
SiO2
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references