ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)
Conchoidal, Uneven, ConchoidalArthur Thomas, Brittle
CaTiSiO 5Ulrich Henn and Claudio C.
Ag 3SbS 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references