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The crystal structure of covellite has been studied under pressure up to 33  kbar  based on single-crystal diffraction intensities collected with a four-circle diffractometer. The contraction of the unit cell takes place in such a way that the axial ratio  c / a  is kept nearly constant, the cell volume at 1  bar  being reduced by about 5% at 33  kbar . With the contraction of the Cu – S bonds the sulfur-sulfur bond of the S 2  group shows a trend of lengthening in a way similar to the relation between S – S and M – S bonds in the compounds MS 2  (M = Cu, Ni, Co, Fe) having the pyrite structure type.

The crystal structure of covellite CuS under high pressure up to 33 kbar