Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.71-2.72-9999
1
7.18
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Fracture
Fibrous
-
Cleavage
{???} Good
None
Mohs Hardness
6-6.53-4
2
10
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Chemical Composition
Ca 6Si 6O 17(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite