Qapf Intrusive. The acronym qapf stands for quartz alkali feldspar plagioclase feldspathoid foid. These are the mineral groups used for classification in qapf diagram.
A qapf diagram is a double triangle diagram which is used to classify igneous rocks based on mineralogic composition. The relative amounts of quartz alkali feldspar plagioclase and feldspathoid are particularly important in classifying intrusive igneous rocks and most plutonic rocks are classified by where they fall in the qapf diagram. The acronym qapf stands for quartz alkali feldspar plagioclase feldspathoid foid.
A qapf diagram is a double ternary diagram which is used to classify igneous rocks based on mineralogic composition.
The relative amounts of quartz alkali feldspar plagioclase and feldspathoid are particularly important in classifying intrusive igneous rocks and most plutonic rocks are classified by where they fall in the qapf diagram. ə ˌ r aɪ t 1 2 is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar typically andesine biotite hornblende and or pyroxene. This is an intrusive magmatic rock and is close to the very hot core of the world which is why it takes longer to cool and therefore the rock is visibly very different from the opposite of the basalt. The acronym qapf stands for quartz alkali feldspar plagioclase feldspathoid foid.
