Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
ConchoidalWalter Schumann
Perfect on {010}, good on {100}
Be 2BO 3(OH)Ulrich Henn and Claudio C.
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references