![]() The point where the lines for Q and P meet is your rock.That will be a line parallel to the left side. Measure along one of the sides, then draw a horizontal line at that point. Draw a line on the ternary diagram below to mark the value of Q, zero at the bottom and 100 at the top.Discard M and recalculate Q, A and P so that they add up to 100 - that is, normalize them.Determine the percentage, called the mode, of quartz (Q), alkali feldspar (A), plagioclase feldspar (P), and mafic minerals (M).In plutonic rocks, all of the minerals are crystallized into visible grains. The QAP ternary diagram is used to classify igneous rocks with visible mineral grains (phaneritic texture) from their feldspar and quartz content. (c) 2008 Andrew Alden, licensed to ( fair use policy) Igneous Rock Classification Diagrams Click the image for a larger version.
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