A QAPF diagram is a doubled-triangle plot diagram used to classify igneous rocks based on their mineralogy. The acronym QAPF stands for "quartz, alkali...

rocks, and most plutonic rocks are classified by where they fall in the QAPF diagram. Dioritic and gabbroic rocks are further distinguished by whether the...

plagioclase. This places andesite in the basalt/andesite field of the QAPF diagram. Andesite is further distinguished from basalt by its silica content...

granitic rocks in the Sierra Nevada, United States. According to the QAPF diagram, granodiorite has a greater than 20% quartz by volume, and between 65%...

feldspar, or feldspathoid minerals, classification begins with the QAPF diagram. The relative abundances of quartz (Q), alkali feldspar (A), plagioclase...

present. This is reflected in the position of the trachyte fields in the QAPF diagram. Biotite, clinopyroxene and olivine are common accessory minerals. The...

Monzogranite is a plutonic rock that occupies the middle of the QAPF diagram, consisting of between 20–60% quartz, and of the remainder, between 35–65%...

feldspar, or feldspathoid minerals, classification begins with the QAPF diagram. The relative abundances of quartz (Q), alkali feldspar (A), plagioclase...

which can be mistaken for rhyolites. For phaneritic felsic rocks, the QAPF diagram should be used, and a name given according to the granite nomenclature...

minerals present. These percentages place the rock somewhere on the QAPF diagram, which often immediately determines the rock type. In a few cases, such...

in dacite, and in many other volcanic rocks, are illustrated in the QAPF diagram. This defines dacite as having a content of 20% to 60% quartz, with plagioclase...

part of the diagram. Ternary diagram, just one triangle QAPF diagram, a common application Wikimedia Commons has media related to Piper diagram. Piper, Arthur...

present. This places basanite in the basanite/tephrite field of the QAPF diagram. Basanite is further distinguished from tephrite by having a normative...

hue; peppered with minor amounts of black minerals. As shown in the QAPF diagram, alkali feldspar granite contains between 20% - 60% quartz. Less quartz...

feldspar content. This places basalt in the basalt/andesite field of the QAPF diagram. Basalt is further distinguished from andesite by its silica content...

usually alkali feldspar. Granitic rocks are classified according to the QAPF diagram for coarse grained plutonic rocks and are named according to the percentage...

volume of its total content of quartz, alkali feldspar, and plagioclase (QAPF) and alkali feldspar makes up 35% to 90% of its total feldspar content. Feldspathoids...

feldspar, and feldspathoid (the QAPF classification). Monzonite is defined as rock having less than 5% quartz in its QAPF fraction and in which alkali feldspar...

as the QAPF diagram, or one of the other diagrams available for igneous rocks may be suitable. Before classifying rocks using the TAS diagram, the chemical...

from the otherwise similar basanite. It's parameters are defined in the QAPF diagram. Occurrences include leucite nepheline tephrite from Hamberg bei Neckarelz...

more than 20% of the total quartz-alkali feldspar-plagioclase-feldspathoid (QAPF) content of the rock. Amphiboles and biotite are common in lesser quantities...

mafic lavas are less explosively violent than felsic-lava eruptions. QAPF diagram List of minerals List of rock types Bowen's reaction series Cross, Whitman;...

plagioclase. Alkali feldspar appears as the silica content becomes high. Under the QAPF classification, plagioclase is one of the three key minerals, along with...

QAPF diagram that shows the quartz (Q), alkali feldspar (A), and plagioclase (P) composition of syenite...

tephritic foidites. Some foidolites are a potential source of aluminium. QAPF diagram Le Maitre, R.W., ed. (2002). Igneous Rocks — A Classification and Glossary...

rhomb porphyry places it in the trachyte - latite classification of the QAPF diagram. Latite is found, for example, as lavas in Bulgaria and as intrusive...

identifies rocks according to mineralogical criteria. Utilising the IUGS QAPF diagram of Streckeisen (1974) "essexite" is more formally known as nepheline...

Under IUGS guidelines, rhyodacites are not formally defined in either the QAPF classification, used to classify igneous rocks by their mineral content,...

rhomb porphyry places it in the trachyte–latite classification of the QAPF diagram. Rhomb porphyry is found in continental rift areas, including the East...

International Union for Quaternary Research International Union of Soil Sciences QAPF diagram International Union of Geological Sciences, International Union of Geological...