Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.50-9999
1
7.18
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Fracture
Uneven, Conchoidal
-
Cleavage
None
None
Mohs Hardness
73-4
2
10
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Chemical Composition
Mn 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006)
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite