The data can be indexed on basis of the standard garnet structure in the space group in close relation to the structure of cryolithionite Na 3 Al 2 Li 3 F 12 and synthetic Na 3 Fe 2 Li 3 F 12 , no indications were found for a symmetry reduction caused by H-Li exchange as a result from the synthesis in an aqueous solution as known for, e.g.,