Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
{111} Indistinct, {111} Indistinct, {111} Indistinct
(K,Cs)Al 4Be 4(B,Be) 12O 28Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
{100} Perfect, {110} Good, {011} Distinct
LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references