Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
CaCO 3Ulrich Henn and Claudio C.