Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.633.69-3.81
1
7.18
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Fracture
Uneven
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
{001} Perfect, {010} Good
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
6-6.58.5
2
10
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Chemical Composition
KAlSi 3O 8Arthur Thomas , Gemstones (2009)
BeAl 2 O 4