Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
-99992.54-2.78
1
7.18
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Fracture
-
Conchoidal
Cleavage
None
Good in three directions
Mohs Hardness
3-45-6
2
10
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Chemical Composition
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references