ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Conchoidal, Brittle, Metallic, ConchoidalArthur Thomas, Gemstones (2009)
(Ca,Mg,Mn)SiO 3Gemdat.org , Management Team (2012)
Ca 3Cr 2(SiO 4) 3Ulrich Henn and Claudio C.