Intrusive igneous rocks. Overview: Intrusive (or, plutonic) igneous rocks form from magma that has cooled below the Earth's surface.
Granite
Granite is rich in quartz, potassium feldspar, and mica (muscovite or biotite). It is the intrusive equivalent of rhyolite.
Where is it used?
Floors
Kitchen
Fireplace
etc.
How was it formed?
Granite forms from the slow crystallization of magma below Earth's surface.
Granodiorite
Compared with granite, granodiorite contains much more plagioclase than potassium feldspar and smaller amounts of quartz. Granodiorite is the intrusive equivalent of dacite.
Diorite
Diorite consists mostly of plagioclase and contains very little, if any, quartz; dark-colored amphibole or pyroxene are also present. This rock is the intrusive equivalent of andesite.
Gabbro
Gabbro is a dark-colored rock that contains abundant pyroxene and olivine, as well as some calcium-rich plagioclase. It is the intrusive equivalent of basalt.
Peridotite
Peridotite is easily identified by its green color, owing to the very large amount of olivine that is present.
Pegmatite
Pegmatites are intrusive igneous rocks that have individual mineral grains that exceed 2 cm in size.
Where is it used?
It is used to construct roads
Used to construct building
How was it formed?
Granodiorite is a plutonic igneous rock, formed by intrusion of silica-rich magma, which cools in batholiths or stocks below the Earth's surface.
Usage
Mostly used like granite we can also use this for design
Formation
Diorite is an intrusive igneous rock formed by the slow cooling underground of magma that has a moderate content of silica and a relatively low content of alkali metals.
Usage
cemetery markers
kitchen counter
Floor tiles
Formation
Gabbro is formed when molten rock is slowly cooled underground over a long period of time.
Usage
Archetctural rock
Formation
Pegmatites are extreme igneous rocks that form during the final stage of a magma's crystallization.
Usage
Scientific purpose
Formation
This rock is formed by crystal settling from magma.
Fun facts
The extreme conditions may produce crystals many feet in length and may weigh more than a ton.
Fun facts
Gabbro rocks are found on earth, moon, mars and many large asteroids
Fun fact
Granite Is the oldest igneous rock in the world. Believed to have formed as long as 300 million years ago
Fun fact
The word peridotite comes from the gemstone peridot
Fun fact
Leucodiorite is a term used to call the different deficient in dark mineral and hornblende. The grade of the rock is turned into ferrodiorite if the iron rich augite like olivine is presented.
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Minerals: Gabbro is mafic, intrusive, coarse-grained rock with allotriomorphic texture. Gabbros contain mainly ferromagnesian minerals and plagioclase, the number of ferromagnesian minerals equaling or exceeding that of the plagioclase.
Minerals: Pegmatites are sometimes sources of valuable minerals such as spodumene (an ore of lithium) and beryl (an ore of beryllium) that are rarely found in economic amounts in other types of rocks.
Minerals: Granite is a coarse-grained, light-colored igneous rock composed mainly of feldspars and quartz with minor amounts of mica and amphibole minerals.
Minerals: Diorite is a very hard intrusive igneous rock made of silicate type minerals.
Minerals: Granodiorite is an attractive, coarse-grained rock. The crystals making up the mass of the rock can easily be seen with the naked eye. The main minerals in granodiorite are feldspar, quartz, hornblende, augite and mica
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