Abstract
Arsenopyrite crystals from Hakansboda (Sweden) have been studied by single crystal X-ray diffraction and analytical transmission electron microscopy. The material contains an excess of sulfur and some cobalt. Microprobe analyses gave a mean value of Feo.87Coo,13Aso.88S1.12' All crystals examined were twinned; the volume ratio of the twinned in- dividuals was taken into account. The structure was refined from 834 independent diffractometer data in the monoclinic space group C2dd and final R = 0.049 and Rw = 0.025 were obtained. The refined occupation numbers of As and S are in good agreement with the microprobe analysis. Fe-S distances range from 2.239 to 2.257, Fe-As distances from 2.336 to 2.375, the As - S distance is 2.346 A, where S and As stands for (As, S) with predominant S and As, respectively. A transmission electron micro- scopestudy revealed antiphase domains and microtwins. Lamellar exsolu- tion was observed in Co-rich specimens. These submicroscopic defects are interpreted on the base of group-subgroup relationships which relate the marcasite to the arsenopyrite structure.
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