The MeNH + 3 cations are present in blocks of (1 × 2 × 3) pseudocubic cages surrounded by cages containing vacancies [Fig. ], with complete occupational order. Half of the MeNH + 3 had disordered orientations, however, with one third disordered about high symmetry positions and one sixth showing disorder unrelated to the crystal symmetry. Additionally, eight symmetry independent NCS -ions were disordered over two sites. The atomic displacement parameters for the MeNH + were significantly larger than that for the framework atoms, indicative of either dynamic or static disorder.