Summary
There is a considerable volume of information on the abundance, distribution and chemical composition of volcanic rocks. In this paper an attempt is made to use these data to construct a simple chemical classification of the volcanic rocks. Silica content is used to divide the rocks into seven major classes; and the major classes are then subdivided using soda, potash, alumina and lime.
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Middlemost, E.A.K. A simple classification of volcanic rocks. Bull Volcanol 36, 382–397 (1972). https://doi.org/10.1007/BF02596878
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DOI: https://doi.org/10.1007/BF02596878