IUGS Chart 1c. QAP. IUGS diagram for naming plutonic/phaneritic igneous rocks with M<90% and with quartz present. This is a combination of the top halves of charts 1a and 1b on one diagram with a plagioclase composition slider. Names are based on the relative modal proportions of quartz (Q), alkali feldspar (A), and plagioclase feldspar (P). Names for plagioclase-rich fields depend on the An proportion of the plagioclase composition. Use the slider to see the classifications for rocks with An>50%.

For only foid-bearing rocks click here: IUGS Plutonic FAP
For the full IUGS QAPF Plutonic chart click here: IUGS Plutonic QAPF