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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