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American Mineralogist; August 1983; v. 68; no. 7-8; p. 790-803
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A TEM study of fibrous cuprite (chalcotrichite); microstructures and growth mechanisms

David R. Veblen, and Jeffrey E. Post

Johns Hopkins Univ., Dep. Earth and Planet. Sci., Baltimore, MD, United States
Harvard Univ., United States

The presence of axial screw dislocations in almost all of the chalcotrichite whiskers of square cross section indicates that they formed by a spiral growth mechanism, thus accounting for their extreme elongation. Ribbon-shaped whiskers are also present. Growth conditions (temperature, pressure, vapor composition, degree of supersaturation) determine whether whiskers or equidimensional crystals will grow, rather than the specific mechanisms of whisker growth.--Modified journal abstract.

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