...Dan Topa; Václav Petřiček; Michal Dušek; Emil Makovicky; Tonči Balić-Žunić Abstract Crystal structures of intergrown lindströmite and krupkaite were determined in two distinct samples by a simultaneous crystal-structure refinement using a modified jana program package. The exsolution...

...Dan Topa; Emil Makovicky; Tonči Balić-Žunić Abstract Crystal structures of stoichiometric gladite (empirical formula Cu 1.32 Pb 1.37 Bi 6.65 S 12.03 ) and krupkaite (empirical formula Cu 2.00 Pb 2.03 Bi 5.99 S 12.04 ) from Felbertal, Austria, were refined to R 1 = 0.045 and 0.037, respectively...

...Allan Pring Abstract The nature of compositional fields in aikinite and krupkaite has been investigated by electron diffraction and high‐resolution transmission electron microscopy. Variation from ideal composition in these minerals results from the disordered intergrowth of krupkaite units...

...W. G. Mumme Abstract Krupkaite, CuPbBi 3 S 6 , from the Juno Mine at Tennant Creek, Northern Territory, Australia, is orthorhombic, space group Pmc 2 1 with a = 4.003(3), b = 11.200(9), c = 11.560(9) Å. Diffraction data were recorded with an equi-inclination diffractometer equipped...

... of the bismuthinite – krupkaite – aikinite solid-solution series. A refinement of the crystal structure was made with single-crystal measurements, which included 2943 observed unique reflections (I > 2σ I ) and resulted in R 1 = 6.6% ( R W = 22.4%). The crystal structure is composed of a fairly complex sequence...

... cell of this “fivefold derivative” contains two “bismuthinite-like” Bi 4 S 6 ribbons and eight “krupkaite-like” CuPbBi 3 S 6 ribbons. The fully occupied Cu sites occur in zigzag [001] rows at y = 0.15, 0.30, 0.70 and 0.85, comprising gladite-like and krupkaite-like intervals in the structure in regular...

... variation within the annealed products. HRTEM was used to monitor Cu ordering and revealed that the distribution of Cu and Pb in the cell is not that of hammarite but of a lower symmetry supercell consisting of the intergrowth of one aikinite cell (two aikinite units) with two krupkaite cells (four...

..., 1974) has established CuPbBi 3 S 6 as a distinct species, to which the name krupkaite has been given. The Z n principle (Moore, 1967) proposed for classification of bismuthinite derivatives has not been followed by the crystal structures found for krupkaite, CuPbBi 3 S 6 , and pekoite, CuPbBi 11 S 18...

.... , bismuthinite ribbons, krupkaite ribbons and aikinite ribbons, could occur in the progressive exsolution or precipitation of a single phase in the bismuthinite–aikinite series. The exceptionally high contents of Ag (0.76–1.27 wt%) in the phase Cu 0.83 Ag 0.10 Pb 0.90 Bi 3.13 S 6 , presumably corresponding...

...Fig. 2. Back scattered electron images showing skeletal intergrowths of krupkaite with gladite and makovickyite-bearing assemblages. (a) Area of nebulous ‘cloud’-like intergrowths (lighter grey) in krupkaite. Homogeneous gladite on left of picture hosts tetradymite. (b) Close-up of ‘cloud’-like...