intermediate rock

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intermediate rock Igneous rock whose chemical composition lies between those of basic and acidic rocks, e.g. andesite. The limits are not fixed rigidly and a number of schemes exist that are based on modal mineralogy and the whole rock chemistry (see MODAL ANALYSIS). Compare ACID ROCK; and BASIC ROCK. See also ALKALINE ROCK.

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intermediate rock An igneous rock with a chemical composition between those of basic and acid rocks. The limits are not fixed rigidly.

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