Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)
{010} moderate, {100} imperfect
Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)