A novel germanate |C6N2H18| (30)[Ge9O18X4](6)[Ge7O14X3](4)[Ge7O14.42X2.58](8)[GeX2](1.73) (X = OH, F) with 30-ring channels built from Ge7O14X3 (Ge-7) and Ge9O18X4 (Ge-9) clusters was obtained under solvothermal conditions. It has a mesoporous pore of 13.0 x 21.4 angstrom(2), which represents the largest pore ring found in crystalline open-framework materials. The framework can be described as a 3-D net structure and viewed as introducing Ge-7 and Ge-9 clusters into the 4,8-heterocoordinated csq net.