Please enable JavaScript.
Coggle requires JavaScript to display documents.
Intrusive igneous rocks. Overview: Intrusive (or, plutonic) igneous rocks…
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.
-
-
-
-
-
-
-
-
Granite Is the oldest igneous rock in the world. Believed to have formed as long as 300 million years ago
Minerals: Granite is a coarse-grained, light-colored igneous rock composed mainly of feldspars and quartz with minor amounts of mica and amphibole minerals.
Granodiorite
Compared with granite, granodiorite contains much more plagioclase than potassium feldspar and smaller amounts of quartz. Granodiorite is the intrusive equivalent of dacite.
-
-
-
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.
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
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.
-
-
-
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.
-
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.
-
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.
-
-
-
-
-
-
-
Gabbro rocks are found on earth, moon, mars and many large asteroids
-
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.
-
-
-
-
-
-