In this article, results based on the research of optical properties of A(2)MX(4) type crystals (A-organic cation, M-metal, X-halogen) composed of different chemical elements are presented. These crystals were grown by the evaporation method from water solutions of AX and MX2 compounds in an appropriate molar ratio. The conducted X-ray investigations show a different crystal structures, ranging from tetragonal to triclinic ones. Also, the structure of the ion complex for Cu2+ crystals varied. The investigation showed both CuCl42- tetrahedral and CuCl4 center dot 2H(2)O(2-) octahedral deformed complexes in investigated crystals. Additionally, the optical spectra of the samples were measured in the range of 250-850 nm. Based on the crystal field theory, it was shown that the shape of absorption spectra and colour of the crystals depend on the distortion of these complexes.