Etymology:
The term "felsic" is derived from the German word "fels", meaning "rock". It was first coined by the German petrologist Ferdinand Zirkel in 1863.
Meaning:
In geology, felsic refers to a type of igneous rock that is characterized by a high proportion of light-colored, silicon-rich minerals, such as feldspar and quartz. These minerals typically give felsic rocks a light color, ranging from white to pink to gray.
Origin:
Felsic rocks are formed when molten rock, or magma, cools and crystallizes beneath the Earth's surface. As the magma cools, the minerals that crystallize out of it are primarily composed of feldspar and quartz, which are light-colored and rich in silicon. This results in the formation of felsic rocks.
Felsic rocks are often associated with continental crust and volcanic eruptions. They are commonly found in areas of plate tectonics, such as mountain ranges and volcanic arcs. Some common types of felsic rocks include granite, rhyolite, and dacite.
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