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What intrusive igneous rock is composed of 18 percent olvine 48 percent pyroxene and 34 percent plagioclase?
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∙ 12y ago
Gabbro is made of these minerals. The proportions can vary.
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∙ 12y ago
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Is granite the same mineral as quartz?
The most abundant minerals in granite are potassium feldspar, plagioclase feldspar, and quartz; with differing amounts of muscovite, biotite, and hornblende-type amphiboles. The most abundant minerals in basalt are amphibole and pyroxene, sometimes plagioclase, feldspathoids, and/or olivine. In other words, no.
Is granite an intrusive rock?
Granite is an intrusive igneous rock.
What family is intrusive rock in?
Igneous
Which one has large grains between intrusive and extrusive igneous rocks?
intrusive
What igneous rock forms from below the Earth's surface?
intrusive igneous rock
Which intrusive igneous rock could be composed of 60 percent pyroxene 25 percent plagioclase feldspar 10 percent olivine and 5 percent amphibole?
gabbro
Which igneous rock is dark colored cooled rapidly on earths surface and is composed mainly of plagioclase feldspar olivine and pyroxene?
scoria
What is an adamellite?
An adamellite is another word for a monzonite, a form of intrusive igneous rock composed mostly of plagioclase and orthoclase.
Which is a coarse-grained igneous rock composed of mainly pyroxene plagioclase feldspar and olivine?
Gabbro.
How is gabbro similar to granite?
The rock is intrusive igneous rock.it is intrusive equivalent of basalt.gabbro is mafic in composition,thus is composed of dark minerals .e.g.olivin,pyroxene,amphiboles and ca+2 -rich plagioclase feldspar.The rock form through intrusion of magma below the earth surface.
What is diorite?
Diorite is an intrusive igneous rock mostly composed of plagioclase feldspar, biotite mica, hornblende, and/or pyroxene. It mostly appears as gray in color, or whitish with black specs--a salt and pepper look. It may contain small amounts of quartz.
What describes an andesite?
Andesite are fine-grainedextrusive, igneous volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, such as hornblende, pyroxene or biotite.(Refer to Geology.com -Igneous Rocks)
How is gabbro formed?
Gabbro is a medium-grained, ultramafic igneous rock. It is made up of plagioclase feldspar and pyroxene. Gabbro is an intrusive igneous rock, meaning that it forms from the solidification of magma within the earth. Intrusive igneous rocks are medium- to coarse-grained because they cool slowly over time
What makes gabbro a rock and not a mineral?
Gabbro is usually made up of minerals such as pyroxene, plagioclase, amphibole and olivine which makes it an intrusive igneous rock.
What are the four kinds of igneous rock?
Igneous rocks are usually classified first by their color index. The color index is separated into four categories. Felsic rocks are the lightest and are composed of mostly quartz and potassium feldspar. Intermediate rocks are the second lightest and are made up of mostly plagioclase feldspar, pyroxene, amphibole, and biotite. Mafic rocks are made up of plagioclase feldspar, pyroxene, and amphibole. Ultramafic is made up of mostly olivine, with pyroxene and amphibole.
What type of rock is hornblende diorite?
Hornblende diorite is a type of intrusive igneous rock. It is composed primarily of plagioclase feldspar, hornblende, and small amounts of other minerals. It has a medium to coarse-grained texture and is typically gray or greenish in color.
Why does gabbro have a higher chemical weathering rate than granite?
Gabbro is mafic intrusive igneous rock and contains olivine, pyroxene, plagioclase and amphibole. These minerals are unstable at low pressure temperature conditions. In contrast, granite is felsic intrusive igneous rock and contains high amounts of quartz and orthoclase. Stability of minerals are increasing top to bottom in Bowen's Reaction Series.
