Crystal structure of of the clinopyroxene diopside (a single chain silicate).
Dark blue: tetrahedral sites (Si); orange: 6-coordinated M1 sites (Mg); light blue: 8-coordinated M2 sites (Ca); red: O
The model was produced in the freeware [Vesta](http://jp-minerals.org/vesta/en/), using crystallographic data from Cameron et al. (1973), downloaded from the [American Mineralogist Crystal Structure Database](http://rruff.geo.arizona.edu/AMS/amcsd.php).