Tenacity
-
Brittle
Solubility
Partially soluble in water
-
Durability
-
-
Specific Gravity
1.773.69-3.81
1
7.18
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Fracture
-
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Perfect on {10 1 0}
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
2-2.58.5
2
10
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Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
BeAl 2 O 4