They are classified on the AQP half of the QAPF diagram based on how much alkali and plagioclase feldspar as well as their quartz content, usually in the 10-50% range.
Syenites are often mistaken for this material which is classified according to a scheme developed by Chappell and White. That scheme divides this material into I type and S type based on whether they descended from Igneous or Sedimentary Protolith. Diapirism, exhibited in lava lamps, is one of the process by which this rock type forms into structures such as (*) dikes and sills inside other rocks. They are classified on the AQP half of the QAPF diagram based on how much alkali and plagioclase feldspar as well as their quartz content, usually in the 10-50% range. This felsic igneous rock forms within other layers of rocks, unlike its extrusive equivalent, rhyolite. FTP, name this intrusive igneous rock which forms most of the earth's continental Â crust and is not basalt.
Syenites are often mistaken for this material which is classified according to a scheme developed by Chappell and White.
Granite