Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
{111} Indistinct, {111} Indistinct, {111} Indistinct
Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
CaBe 2(PO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006)