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Single crystals of distrontium lithium beryllium triborate, Sr2LiBeB3O8, were obtained by spontaneous nucleation from a high-temperature melt. In the Sr2Li[BeB3O8] structure, [BeB2O7]6− rings, made up from one BeO4 tetrahedron and two BO3 triangles, are connected to each other by [BO3] triangles to form the smallest repeat unit {[BeB3O8]8−} and then form chains along the b axis. The Sr2+ cations are seven- or eight-coordinated and Li+ cations are tetra-coordinated and lie between the chains.