intermediate rock

views updated May 08 2018

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.

A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY

intermediate rock

views updated May 23 2018

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

A Dictionary of Ecology MICHAEL ALLABY

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