Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.97-2.22-9999
1
7.18
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Fracture
Conchoidal
-
Cleavage
None
None
Mohs Hardness
6-6.53-4
2
10
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Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001) More from other references
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite