Optimum conditions for the growing of single crystals of Li2Mn(PO3)4 compound have been selected. Complete X-ray diffraction analysis has been performed to study synthesized phosphate Li2Mn(PO3)4. According to its structure, the double phosphate belongsto the orthorhombic crystal system, space group Pnma; lattice parameters are the following: a = 9.268(1), b = 9.421(1), c = 10.088(1), V = 880.93, Z = 4, Pcalc. = 2.901 g/cm3. Structural features of the synthesized phosphate have been determined. The compound has been studied using DTA and IR spectroscopy techniques along with the complete elemental analysis.