The title compound was obtained by the flux method and its structure was determined. It crystallizes in monoclinic, space group P2/c with a = 11.0024(17), b = 9.2979(14), c = 14.500(2), β = 110.879(2)°, V = 1385.9(4) 3, Z = 4, Mr = 908.38, F(000) = 1592, μ = 19.601 mm–1, Dc = 4.353 g/cm3, the final R = 0.0481 and wR = 0.1257 for 2532 observed reflections with I > 2σ(I). The Rb3La3(BO3)4 structure can be viewed as a 3-dimensional scaffold-like framework constructed by La–O polyhedra and BO3 groups. Two Rb+ ions locate in a channel along the a direction and the rest one in a cavity.
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