Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.42-2.582.62-2.67
1
7.18
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Fracture
Conchoidal, Splintery, ConchoidalWalter Schumann
Uneven
Cleavage
[010] perfect
From the Greek, oligos and kasein, little cleavage.
Mohs Hardness
4-56-6.5
2
10
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Chemical Composition
AlPO4 · 2(H2O)
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)