Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Irregular
CaBSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references