Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
{110} Perfect, {010} Indistinct
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.