Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Gems, Uneven
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)
KAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references