QAPF classification
QAPF classification A modal classification scheme for igneous rocks with a colour index less than 90, based on the relative proportions of: quartz to quartz plus total feldspars (Q); alkali feldspar to total feldspars (A); plagioclase to total feldspars (P); and feldspathoids to feldspathoids plus total feldspar (F).
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QAPF classification