Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
CaCO 3Ulrich Henn and Claudio C.