Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Al 6B 5O 15(F,OH) 3Ulrich Henn and Claudio C.
From the Greek for luster, for its pearly luster on the cleavage.
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)