Abstract
A knowledge of the distribution of crystal sizes and shapes can prove critical to an understanding of the emplacement and cooling history of igneous rocks. We outline here a relatively automated method, which uses standard image processing techniques to acquire size, shape and modal data for olivine phenocrysts and voids in a suite of picritic Hawaiian basalts. The technique requires nothing more than a petrographic microscope fitted with a digital camera, and a PC which will run off-the-shelf image processing software. The method could be adapted to a variety of petrographic problems and its use need not be restricted to the study of igneous rocks.
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