Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.75-9999
1
7.18
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Fracture
Conchoidal
-
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
None
Mohs Hardness
4.5-53-4
2
10
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Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite