Abstract
Abstract The calcite crystals from Thomasville include dramatic large twins on (0001) and much smaller but interesting twins on the rarely seen law (0221). Both kinds of twins are distorted relative to untwinned crystals. Twins on (0001) are stubbier, whereas twins on (0221) are greatly elongated, with a much reduced set of faces. Both forms of distortion can be related to a growth advantage provided by the twin plane.
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