Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.20-2.263.69-3.81
1
7.18
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Fracture
Uneven
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Perfect on {110}
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
5-5.58.5
2
10
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Chemical Composition
Na 2[Al 2Si 3O 10] · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
BeAl 2 O 4