Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic
Uneven, Brittle, Metallic, Gemstones (2009)
Mg 2Si 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 2[Al 2Si 3O 10] · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references