Fig. 3
From: Penta- and hexa-coordinated beryllium and phosphorus in high-pressure modifications of CaBe2P2O8
Crystal structure of hurlbutite-III, CaP2Be2O8 at 83.2 GPa. BeOn and POn polyhedra are given in blue and yellow. Ca and O atoms are given as blue and red spheres, respectively. Black solid line outlines a unit cell. Insets represent the trigonal bipyramidal geometry of PO5 and BeO5 groups
