Uneven, Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
SiO 2 + H 2OUlrich Henn and Claudio C.