Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
CaMgSi2O6
(Ca,Mg,Mn)SiO 3Gemdat.org , Management Team (2012)