Chrysoberyl, Al2BeO4, is isomorphous with olivine; the space group is Pnma, ortho-rhombic, with a=9.404, b=5.476 and c—4.427 Å. The oxygen positions approximate hexagonal close-packing with aluminum cations occupying octahedral interstices and beryllium in tetrahedral sites. Accurate atomic coordinates were obtained by least-squares analysis of three-dimensional x-ray diffraction data. Both the octahedra and tetrahedra are distorted, showing significant deviations from their mean bond lengths: A1-O 1.91 Å and Be—O 1.63 Å.

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