A refinement of the crystal structure of covellite, CuS

Low-temperature structural distortion in CuS

“…This has in the years following Oftedal's report on the structure in 1932, triggered several single crystal X-ray diffraction studies. The originally described structure was thereby confirmed and reliable values for the interatomic distances reported (Berry, 1954;Kalbskopf et al, 1975;Evans and Konnert, 1976;Ohmasa et al, 1977).…”

Noncentrosymmetric rare-earth copper gallium chalcogenides RE3CuGaCh7 (RE=La–Nd; Ch=S, Se): An unexpected combination

“…The Cu-Ch distances (2.20-2.35 Å in RE 3 CuGaS 7 ; 2.32-2.47 Å in RE 3 CuGaSe 7 ) fall within the normal ranges found around three-coordinate Cu atoms (2.2-2.4 Å in sulfides; 2.3-2.5 Å in selenides) [4]. For example, CuS (covellite) contains among the shortest observed trigonal Cu-S bonds of 2.19 Å [35][36][37][38].…”

Adsorption of O-isopropyl-N-ethyl thionocarbamate on Cu sulfide ore minerals

“…On that basis, a basal plane fracture surface would be expected to be dominated by broken CuAS bonds parallel to the c-axis rather than broken disulfide bonds, and hence significant reconstruction of the two different opposing fracture surfaces would be anticipated. However, Ohmasa et al (1977) argued that the highly perfect cleavage characteristic of covellite could be ascribed to the short (0.219 nm) trigonal Cu(1)AS(1) bonds being stronger than the more typical tetrahedral 0.234 nm Cu(2)AS(1) and 0.231 nm Cu(2)AS(2) bonds. They also noted that the S(2)AS(2) distance was longer than for VS 4 (0.203-0.204 nm), but they did not speculate on the more likely bond broken during cleavage of covellite.…”