Polyhedral model of larnite (Ca2SiO4) - calcium-rich olivine found in contact-metamorphosed chalk, type locality at Scawt Hill near Larne, Co. Antrim, Northern Ireland.
Model created in VESTA (https://jp-minerals.org/vesta/en/) with data from the American Mineralogist Crystal Structure Database (http://rruff.geo.arizona.edu/AMS/amcsd.php)