Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.20-2.26-9999
1
7.18
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Fracture
Uneven
-
Cleavage
Perfect on {110}
None
Mohs Hardness
5-5.53-4
2
10
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Chemical Composition
Na 2[Al 2Si 3O 10] · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite