Granite is a common and widely-occurring group of intrusive folic igneous rocks that form at great depths and pressures under continents. Granite consists of orthoclase and plagioclase feldspars, quartz, hornblende, biotitic, muscovite and minor accessory minerals such as magnetite, garnet, zircon and apatite. Rarely, a pyroxene is present. Ordinary granite always carries a small amount of plagioclase, but when this is absent the rock is referred to as alkali granite. An increasing proportion of plagioclase feldspar causes granite to pass into grandiosity. A rock consisting of equal proportions of orthoclase and plagioclase plus quartz may be considered a quartz monzonite. A granite containing both muscovite and biotitic micas is called a binary granite. The average density is 2. 75 g/cm3 with a range of 1. 74 to 2. 80. Granite is a common and widely-occurring group of intrusive felsic igneous rocks that form at great depths and pressures under continents. Granite consists of orthoclase and plagioclase feldspars, quartz, hornblende, biotite, muscovite and minor accessory minerals such as magnetite, garnet, zircon and apatite. Rarely, a pyroxene is present. Ordinary granite always carries a small amount of plagioclase, but when this is absent the rock is referred to as alkali granite. An increasing proportion of plagioclase feldspar causes granite to pass into granodiorite.
a rock consisting of equal proportions of orthoclase and plagioclase plus quartz may be considered a quartz monzonite. A granite containing both muscovite and biotite micas is called a binary granite. The average density is 2. 75 g/cm3 with a range of 1. 74 to 2. 80.
the word granite comes from the latin granum, a grain, in reference to the coarse-grained structure of such a crystalline rock.
granite is a common and widely occurring type of intrusive, felsic, igneous rock.
granites are usually medium to coarse grained, occasionally with some individual crystals larger than the groundmass forming a rock known as porphyry. Granites can be pink to dark gray or even black, depending on their chemistry and mineralogy.
outcrops of granite tend to form tors, rounded massifs, and terrains of rounded boulders cropping out of flat, sandy soils. Granites sometimes occur in circular depressions surrounded by a range of hills, formed by the metamorphic aureole or hornfels.
granite is nearly always massive, hard and tough, and it is for this reason it has gained widespread use as a construction stone.
the average density of granite is 2. 75 g·cm−3 with a range of 1. 74 g·cm−3 to 2. 80 g·cm−3.
the word granite comes from the latin granum, a grain, in reference to the coarse-grained structure of such a crystalline rock
