Qapf Classification Of Igneous Rocks. A qapf diagram is a double ternary diagram which is used to classify igneous rocks based on mineralogic composition. But the great majority of real world rocks can be classified using a few simple graphical aids.
But the great majority of real world rocks can be classified using a few simple graphical aids. These are the mineral groups used for classification in qapf diagram. The acronym qapf stands for quartz alkali feldspar plagioclase feldspathoid foid.
Qapf diagram the classification of igneous rocks used to be a real mess.
A qapf diagram is a double triangle diagram which is used to classify igneous rocks based on mineralogic composition. These are the mineral groups used for classification in qapf diagram. Q quartz a alkali feldspar orthoclase but including albite sodium plagioclase if anorthite calcium plagioclase content does not exceed 5 p plagioclase f feldspathoids silica poor minerals m mafic minerals such as pyroxene amphibole olivine and mica in the qapf classification each corner. These are the mineral groups used for classification in qapf diagram.
