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Which igneous rock is composed of coarse grained crystals of quartz feldspar and mica?
Felsic igneous rocks (the lightest in color) are comprised mostly of quartz and potassium feldspar. Intermediate igneous rocks (somewhat darker than felsic) are made up of some quartz and potassium feldspar, but mostly plagioclase feldspar.
Which igneous rock is dark colored cooled rapidly on earths surface and is composed mainly of plagioclase feldspar olivine and pyroxene?
scoria
What are the two main feldspar groups?
The two main feldspar groups are potassium feldspar (orthoclase and microcline) and plagioclase feldspar (albite and anorthite). They are common rock-forming minerals in the Earth's crust and are essential components in many igneous and metamorphic rocks.
How do you classify igneous rocks from other types of rock?
Igneous rocks are identified by first looking at the color index. Felsic igneous rocks contain mostly potassium feldspar. Intermediate igneous rocks contain mostly plagioclase feldspar. Mafic igneous rocks contain pyroxene, olivine, and plagioclase feldspar. Ultra mafic igneous rocks contain mostly olivine. Then igneous rocks are identified based on texture. For example, the texture of igneous rocks can be aphanitic, pegmatitic, phaneritic, glassy, vesicular, etc.
What kind of rock is granodionite?
Granodiorite is a coarse-grained intrusive igneous rock that is similar to granite but contains more plagioclase feldspar than orthoclase feldspar. It typically has a salt-and-pepper appearance due to the mixture of light and dark minerals. Granodiorite forms from the slow cooling of magma deep within the Earth's crust.
What greyish igneous rock contains plagioclase feldspar and small amounts of quartz and olivene?
None, you don't get quartz and olivine in the same igneous rock.
A certain igneous rock contains about 25 percent dark silicate minerals The remainder of the rock is mostly plagioclase feldspar What type of composition does tthis igneous rock have?
ultramafic
Sand collected at a beach contains a mixture of pyroxene olivine amphibole and plagioclase feldspar . The rock from which this mixture of sand came is best described as?
The rock most likely belongs to the igneous category, such as a basalt that contains pyroxene, olivine, amphibole, and plagioclase feldspar.
What igneous rocks have a mineral composition between that of granitic and basaltic rocks?
Andesite and diorite are two common igneous rocks that have a mineral composition intermediate between granitic and basaltic rocks. Andesite is fine-grained and contains plagioclase feldspar and pyroxene minerals, while diorite is coarse-grained and composed of plagioclase feldspar, amphibole, and other minerals.
Would you expect to find plagioclase feldspar or biotite in a greater variety of igneous rocks?
You would expect to find plagioclase feldspar in a greater variety of igneous rocks compared to biotite. Plagioclase feldspar is a more common mineral and is found in both mafic and felsic rocks, while biotite is typically found in intermediate to felsic rocks.
When An igneous rock that contains mostly plugholes feldspar and about W percent dark silicates minerals has a composition that is?
Igneous rocks containing mostly plagioclase feldspar and a significant percentage of dark silicate minerals are typically classified as basaltic rocks. These rocks have a composition that is intermediate between mafic and felsic rocks, with a silica content of around 50-60%. Basaltic rocks often form from the solidification of magma with a basaltic composition.
What is the most common group of silicates?
The most common group of silicates is the feldspar group, which includes minerals like orthoclase, plagioclase, and microcline. Feldspar minerals account for about 60% of the Earth's crust and are essential components of many igneous, metamorphic, and sedimentary rocks. They are characterized by their framework structure and are primarily composed of aluminum, silicon, and oxygen, often with varying amounts of other elements.
Is plagioclase a mineral?
Yes, plagioclase is a group of minerals within the feldspar family. It is a common mineral found in igneous rocks such as granite and basalt.
What type of composition does an igneous rock have that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals?
The igneous rock with mostly plagioclase feldspar and about 30 percent dark silicate minerals is likely a basalt. Basalt is a fine-grained extrusive rock that is commonly found in oceanic crust and volcanic islands. The dark silicate minerals in basalt are typically pyroxene and olivine.
What is plagioclase feldspar with quartz and olivine?
Plagioclase feldspar is a common mineral in igneous rocks, while quartz is a mineral often found in a variety of rocks. Olivine is a green mineral commonly found in mafic igneous rocks. When all three minerals are present in a rock, it typically indicates a mafic igneous rock such as basalt or gabbro.
Definitions for basaltic composition?
a compositional group of igneous rocks indicating that the rock contains substantial dark silicate minerals and calsiumrich plagioclase feldspar. a compositional group of igneous rocks indicating that the rock contains substantial dark silicate minerals and calsiumrich plagioclase feldspar.
Which igneous rock is composed of coarse grained crystals of quartz feldspar and mica?
Felsic igneous rocks (the lightest in color) are comprised mostly of quartz and potassium feldspar. Intermediate igneous rocks (somewhat darker than felsic) are made up of some quartz and potassium feldspar, but mostly plagioclase feldspar.
