Gems, Sixth Edition (2006), Gems, Sixth Edition (2006)
Uneven, Subconchoidal, Uneven, Subconchoidal, Conchoidal, Brittle
SiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references