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Alkali feldspar granite, some varieties of which are called 'red granite', [1] is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar (K-spar). It is a dense rock with a phaneritic texture. The abundance of K-spar gives the rock a predominant pink to reddish hue; peppered with minor amounts of black minerals. [2] [3]
Mafic enclave in granite rock, at Yosemite National Park Granite forms from silica-rich ( felsic ) magmas. Felsic magmas are thought to form by addition of heat or water vapor to rock of the lower crust , rather than by decompression of mantle rock, as is the case with basaltic magmas. [ 19 ]
Felsic magmas and lavas have lower temperatures of melting and solidification than mafic magmas and lavas. Felsic rocks are usually light in color and have specific gravities less than 3. The most common felsic rock is granite. Common felsic minerals include quartz, muscovite, orthoclase, and the sodium-rich plagioclase feldspars (albite-rich).
Known as an inflammation of one or more joints, causing pain and stiffness that can worsen with age, arthritis is extremely common and is reported in 3 million US cases per year.
S-type granites, like other granite types, can vary in crystal size from aphanitic to phaneritic; crystal size distributions include porphyritic, seriate, and rarely equigranular textures. Mafic xenoliths/enclaves can be found in S-type granites. Granophyric textures can be found in S-type granites, particularly leucocratic ones.
The Lilesville Granite (right) next to a mafic dike (left) taken at Vulcan Materials Quarry. Contact is shown between the two units. During the late Precambrian-early Cambrian, there was an accumulation of felsic volcanic rocks and argillite , a fine grained sedimentary rock.
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