Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
-99992.25-2.40
1
7.18
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Fracture
-
-
Cleavage
None
perfect on {010}; good on {100}
Mohs Hardness
3-45-5.5
2
10
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Chemical Composition
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references