Abstract
A full-pattern X-ray powder-diffraction refinement reveals that NaBSiO4 prepared at 6 GPa and 700°C crystallizes in space group P21/n with the structure of beryllonite, NaBePO4. With a 7.9845(5), b 7.6969(5), c 13.9432(9) A, 90.081(6)° and V 856.89(2) A 3 , NaBSiO4 has the smallest unit-cell volume of all known compounds with the beryllonite structure. A naturally occurring counterpart could be the unnamed mineral UK53 from Mont Saint-Hilaire, Quebec, Canada. The crystal structure of monoclinic NaBSiO4 is closely related to that of the hexagonal mineral malinkoite, with the same chemical composition. The structural differences are mainly caused by variant arrangements of two kinds of six-membered rings made up of alternating (BO4) and (SiO4) tetrahedra.
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