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The new synthetic hydrous layer silicate with code RUB-39, H2[Si18O38]·2(C8H20N)·xH2O, was synthesized from hydrothermal solution after 3 weeks at 150 °C and autogenous pressure. The material crystallized as a colorless, fine-grained powder of sub-micrometer crystallite size. The powder diagram was indexed in the monoclinic space group P2/c with a = 7.33122(5) A, b = 10.72380(13) A, c = 17.51354(12) A, and β = 115.69(6)°. The Rietveld refinement of the crystal structure was refined from laboratory powder X-ray diffraction data based on a structure model derived from the condensation product, zeolite RRO, with final residuals of Rwp = 12.3% and χ2 = 3.1. The silicate layers of the new hydrous layer silicate are known as subunits of the silicate framework of the natural zeolite mineral heulandite and represent a basic construction principle of silicate framework structures. They are interconnected through strong interlayer hydrogen bonds. The remaining residual void space is filled with the organic template...