Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
-99995.85-6.15
1
7.18
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Fracture
-
Conchoidal
Cleavage
None
Fair in four directions forming octahedrons
Mohs Hardness
3-43.5-4
2
10
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Chemical Composition
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references