Blaubleibender covellite and its relationship to normal covellite |
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| Authors: | A Putnis J Grace W E Cameron |
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| Institution: | (1) Department of Mineralogy and Petrology, University of Cambridge, Downing Place, CB2 3EW Cambridge, England;(2) Department of Geology, Western Michigan University, 49008 Kalamazoo, Michigan, USA |
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| Abstract: | Both natural and synthetic samples of blaubleibender (blue-remaining) covellite have been studied by reflected light microscopy, electron probe microanalysis and electron microscopy and diffraction. The natural sample of composition Cu1.20S has a  19a × 19a superstructure based on the hexagonal coveilite subcell (side a). The synthetic sample of composition Cu1.10S has a 27 a × 2 7a superstructure. In both cases the phases are homogeneous. The evidence suggests that the recognition of two distinct types of blaubleibender covellite may be an oversimplification, and that a series of metastable superstructures based on the covellite structure may exist.Work done while on leave at the Department of Mineralogy and Petrology, Cambridge |
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