By David J. Vaughan
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Extra resources for Sulfide Mineralogy and Geochemistry (Reviews in Mineralogy and Geochemistry 61)
Thus, 18R has the stacking sequence hccchchccchchccchc,and 24R is (cccchcch)3. In the alternative notation these sequences are AB′A′C′B′ABC′B′A′C′BCA′C′B′A′C, and ABC′B′A′C′B′ABCA′C ′B′A′C′BCAB′A′C′B′A′C. Finally, 36R has the stacking (cccccchcccch)3, starting as ABCABC′B′A′C′B′A′C′, and followed by the rhombohedrally displaced variations of this sequence. As a result of the above-defined difference in layer multiplicities, each of the two cubic subsets is arranged in a rhombohedral stacking sequence (Fig.
According to the number of distinct cations present in ordered substitution for the Zn of the aristotypes. This replacement results in a “tree” of sub- and supergroup relationships between the ZnS aristotypes and the homeotypes of various compositions. Ordered vacancies enter these relationships as well. ,in atomic radii of the species occupying these sites) for the preference of the structure for a wurtzite or sphalerite stacking principle. Sphalerite–wurtzite. The two fundamental polytypes, cubic sphalerite and hexagonal wurtzite, differ by possessing ccp and hcp arrays of anions, respectively.
In the c direction, four such layers follow one another, with origin shifts ½a1, ½a2, −½a1, −½a2, producing the familiar Fe/Cu distribution in the unit cell of chalcopyrite. Neutron diffraction studies (Donnay et al. 1958) and Mössbauer investigations (summarized by DiGiuseppe et al. 1974) suggest that Cu in chalcopyrite is univalent whereas iron is trivalent. 06°). Lenaite AgFeS2 (Zhuze et al. 1958) and gallite CuGaS2 (Abrahams and Bernstein 1973) are isostructural, as also are CuGaSe2 (Abrahams and Bernstein 1974), the technologically important CuInS2 (Abrahams and Bernstein 1973), and CuGaTe2 (Leon et al.