ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic
Al 2(Cl 2O 12) · 18H 2OUlrich Henn and Claudio C.
Mg 2Si 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references