Subconchoidal, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.