My periodic table poster is now available! Diopside. Description from the source: Diopside (Ca Mg Si2 O6 mon.), Jalpur, India. Green, geminated crystals. 2x1,2x1 cm; 5 g. Source: Simone Citon Contributor: John Gray Acquired: 14 October, 2008 Text Updated: 14 October, 2008 Price: Trade Size: 0.75" Composition: CaMgSi2O6