Tenacity
Brittle
-
Solubility
insoluble
-
Durability
-
-
Specific Gravity
2.40-9999
1
7.18
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Fracture
Subconchoidal, ConchoidalWalter Schumann, Conchoidal
Conchoidal
Cleavage
Perfect on {001}, poor on {201} with 38.5° angle between the two
None
Mohs Hardness
6-6.57-7.5
2
10
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Chemical Composition
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.