Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic
Uneven
Mg 2Si 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references