Morphology changes in etch pits formed on the (10 1 4) cleavage plane of calcite were induced by varying the ratio of [Ca 2+ ] to [CO 3 2 - ] in the bulk solution as well as through the addition of the crystal poison 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP). Three distinct morphologies were noted: symmetric rhombic, asymmetric rhombic, and triangular with a rough curved hypotenuse. The latter represents a transient morphology which is only observed during the actual dissolution process, while the former morphologies persist after dissolution is halted.
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Britt et al. (1997) studied this question.
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