Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
SbTaO 4Ulrich Henn and Claudio C.