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Abstract
The aim of the paper was a search for polymorphism in LiNH4SeO4 (LASe) single crystals and the study of the structure of the only known α-modification of LASe. We found the α-LASe to be isomorphous with α-LiNH4SO4 (the space group Pca21). Two kinds of polytypes, the A with cA = c and the B with cB = 2c, were observed. The two polytypes were found to exist simultaneously in each single crystalline sample with the B-polytype prevailing. This superstructure is found to affect the α rightarrow β polymorphous transformation.