Uneven, Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
Uneven, Subconchoidal, Uneven, Subconchoidal, Conchoidal, Brittle
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references