Partial rotation along one of the symmetry axes of the molecule results in the higher hexagonal or rhombohedral symmetries, which turn into a cubic structure when the molecules start freely rotating.
2.
This symmetry, however, is due to twinning of fine domains with rhombohedral symmetry, trigonal-3m, point group R-3m, a = 3.92 ? c = 48 ? Z = 15 for formula Cu 1.8 S . Metastable digenite changes with time to stable low temperature digenite or a mixture of anilite Cu 7 S 4 and djurleite Cu 31 S 16.
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