Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
KAlSi 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references