ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)
Uneven, Conchoidal, UnevenArthur Thomas, Brittle
SiO 2(+Al 2O 3)Walter Schumann , Gemstones of the world (2001)
Fe2+ CO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references