Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.51-2.53-9999
1
7.18
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Fracture
Conchoidal, Splintery
-
Cleavage
None
None
Mohs Hardness
53-4
2
10
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Chemical Composition
KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite