Bannister, Hey and Stadler (1947) showed that nigerite has the approximate formula (Zn, Mg, Fe) (Sn, Zn)2 (Al, Fe)12 O22 (OH)2. They reported that it is trigonal with symmetry 3m, and a and c are equal, respectively, to 5.72 and 13.86 Å. The value of a is about four times the radius of an oxygen ion, while c is about six times the closest-packed oxygen interplanar distance.

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