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An X-ray diffraction study of single crystals of acuminite, a strontium aluminium fluoride mineral from Ivigtut, Greenland [SrAlF 4 (OH) · H 2 O,  a  = 13.223(1) Å,  b  = 5.175(1) Å,  c  = 14.251(1) Å,  β  = 111.61(2),  C 2/ c ,  Z  = 8,  D m   = 3.295 g cm −3 ,  D c   = 3.305 g cm −3 ] used 2138 diffraction intensities (CAD-4 diffractometer), and was refined to  R  (unweighted) = 0.069. The strontium ions are 9-coordinated to 7 fluoride ions and 2 water molecules, the aluminium ions have octahedral coordination, 4 fluoride ions and 2 hydroxyl ions. The structure of acuminite is compared with the structure of tikhoenkovite another modification of SrAlF 4 (OH) · H 2 O.

The structure of acuminite, a strontium aluminium fluoride mineral