Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.70-9999
1
7.18
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Fracture
-
-
Cleavage
None
None
Mohs Hardness
6.5-73-4
2
10
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Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite