Cleavage
Perfect on {001}, good on {210}, poor on {010}
Perfect on {001}, very good on {010}, imperfect on {110}
Chemical Composition
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)