1 Physical Properties
1.1 Tenacity
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1.2 Solubility
Not Available
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1.3 Durability
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1.4 Specific Gravity
1.5 Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
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1.6 Cleavage
Not Available
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1.7 Mohs Hardness
1.13 Chemical Composition
MgAlBO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Y 3Al 5O 12Ulrich Henn and Claudio C.