* Felsic rocks are light-colored, rich in silica (SiO2), and typically contain minerals like quartz, feldspar, and mica. Examples include granite and rhyolite.
* Intermediate rocks fall in between felsic and mafic in composition. They have a darker color than felsic rocks and contain minerals like plagioclase feldspar, amphibole, and pyroxene. Examples include diorite and andesite.
While the continental crust is mostly composed of igneous and metamorphic rocks, it also contains some sedimentary rocks. These are formed from the accumulation and cementation of sediments, which can be derived from the weathering and erosion of pre-existing rocks.
Here's a more detailed look at the composition:
* Igneous Rocks:
* Granite: The most abundant rock type in the continental crust.
* Rhyolite: A volcanic equivalent of granite.
* Diorite: A darker, more mafic rock than granite.
* Andesite: A volcanic equivalent of diorite.
* Metamorphic Rocks:
* Gneiss: A metamorphic rock derived from granite.
* Schist: A metamorphic rock that can be derived from various protoliths, including sedimentary and igneous rocks.
* Marble: A metamorphic rock derived from limestone.
* Sedimentary Rocks:
* Sandstone: Formed from cemented sand grains.
* Shale: Formed from compacted clay.
* Limestone: Formed from the accumulation of marine organisms.
It's important to note that the composition of the continental crust can vary depending on the specific location. However, the general trend is that it is composed of a higher percentage of felsic and intermediate rocks than the oceanic crust.
