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Microscopy and minerals images Catalogue of Rocks collected by A. LACROIX Informations of catalogues that are provided on the website mainly document the concepts of the rock classifications used during the first half of the twentieth century. Consequently, significance of these informations are mainly historical. New Identification of the rocks of this collections based on modern concept is in progress. It is recomanded to potential user to consult litterature concerning the present-day rock nomenclature and equivalences between outdated and accepted present-day rock names*. * - Le Maitre, R. W. Catalogue of Rocks collected by A.