Disclinations in unusual graphite crystals from anorthosites of Ukraine

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We describe unusual forms of graphite crystals in anorthosites from the Korsun-Novomigorod pluton in Ukraine. A complete series of crystal morphologies exists, from tabular, to coumnar, to psuedodipyramidal and pseudodipyramidal-prismatic, to nearly spherical. On the basis of our morphological observations, we present a possible mechanism of growth based on spiral-layer and polycentric growth in the presence of negative wedge disclinations.

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© 1999 Mineralogical Association of Canada. Publisher's version of record available here: http://www.canmin.org/content/37/4/951.full.pdf+html

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Canadian Mineralogist