Of the many varieties of limestone most have been deposited in shallow water. Organic limestones (e.g., chalk) are formed from the calcareous skeletons of marine organisms. Precipitated limestones include oolite, which is composed of ooliths – spherical bodies formed by the precipitation of carbonate around a nucleus. Clastic limestones are derived from fragments of pre-existing calcareous rocks. Limestone is used as building stone, and in the manufacture of lime, carbon dioxide, and cement.
Related category GEOLOGY AND PLANETARY SCIENCE
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