Uneven, Subconchoidal, Uneven, Subconchoidal, Conchoidal, Brittle
Gems, Conchoidal, Brittle
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Ca 3Ti4+2(Fe3+2Si)O 12Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references