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Abstract
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 e/a is kept nearIy 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 S2 group shows a trend of lengthening in a way similar to the relation between S - S and M - S bonds in the compounds MS2 (M = Cu, Ni, Co, Fe) having the pyrite structure type.
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