Uneven, Subconchoidal, Uneven, Subconchoidal, Conchoidal, Brittle
Splintery, Brittle, Uneven
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)