Which rock is composed of plagioclase feldspar and pyroxene?

Which rock is composed of plagioclase feldspar and pyroxene?

Mafic Mafic: rocks that contain mostly pyroxenes and olivine plus plagioclase feldspar and/or feldspathoid minerals, eg. basalt.

Which is a coarse-grained igneous rock composed mainly of pyroxene plagioclase feldspar and olivine?

Gabbro is a coarse-grained, dark-colored, intrusive igneous rock that contains feldspar, pyroxene, and sometimes olivine.

Which rock is composed of intermediate magma and contains amphibole and plagioclase feldspar?

Igneous rocks contain the following common minerals: Plagioclase feldspar, Olivine, Potassium feldspar, Pyroxene, Quartz, Amphibole, Biotite, and Muscovite.

Which of these igneous rocks is composed of the minerals pyroxene plagioclase feldspar and olivine?

Igneous rocks composed of plagioclase feldspars and silicate minerals high in iron and magnesium, such as olivine and pyroxenes (augite), are known as mafic or ferromagnesian.

Which rock has an intermediate composition?

Intermediate is a composition between felsic and mafic. It usually contains roughly-equal amounts of light and dark minerals, including light grains of plagioclase feldspar and dark minerals like amphibole.

What is an intermediate igneous rock?

Igneous Rocks by Composition Intermediate rocks are roughly even mixtures of felsic minerals (mainly plagioclase) and mafic minerals (mainly hornblende, pyroxene, and/or biotite). There is little or no quartz.

What type of rock is basalt?

Basalt is a hard, black volcanic rock. Basalt is the most common rock type in the Earth's crust. Depending on how it is erupted, basalt can be hard and massive (Figure 1) or crumbly and full of bubbles (Figure 2).

What is coarse grained igneous rock?

(a) Said of a crystalline rock, and of its texture, in which the individual minerals are relatively large; specif. said of an igneous rock whose particles have an average diameter greater than 5 mm (0.2 in.).

Which of the following is a coarse-grained igneous rock that contains quartz and feldspar?

Granite The correct answer is Granite. Granite is is a coarse-grained igneous rock that contains quartz and feldspar.

Which igneous rocks are intermediate?

Typical intermediate rocks include andesite, dacite and trachyandesite among volcanic rocks and diorite and granodiorite among plutonic rocks.

What minerals are in intermediate rocks?

Intermediate rocks are roughly even mixtures of felsic minerals (mainly plagioclase) and mafic minerals (mainly hornblende, pyroxene, and/or biotite). There is little or no quartz. Felsic rocks are mostly feldspar (especially K-feldspar), at least 10% quartz, and less than 15% mafic minerals (biotite, hornblende).

Which pyroxene is in basalt?

Basalt is the most widely distributed basic extrusive rock, with a SiO2 content ranging from 45% to 52%, and is mainly composed of basic plagioclase and monoclase pyroxene, followed by orthopyroxene, peridot and amphibole.

Is basalt fine or coarse grained?

Basalt is a fine-grained mafic igneous rock. It is commonly vesicular and aphanitic.

Which of the following is an example of a rock with an intermediate composition?

Typical intermediate rocks include andesite, dacite and trachyandesite among volcanic rocks and diorite and granodiorite among plutonic rocks.

What are the most common coarse rocks?

Most Common Types of Igneous Rocks

  • Types. There are two kinds of igneous rocks. …
  • Granite. Granite is a medium to coarse-grained igneous rock that is formed intrusively. …
  • Basalt. Basalt is one of the most common types of igneous rocks in the world. …
  • Gabbro. …
  • Pumice.

Apr 25, 2017

What type of igneous rock consists of very coarse crystals?

Pegmatitic Texture Igneous Rock Classification

Pegmatitic Texture (Extremely Coarse-Grained) Originates from water-rich intrusions, which cool and crystallize underground
Composition Most Common Minerals Rock Name
Glassy Texture Originates from cooling too rapid to allow crystal lattices to form
Composition Most Common Minerals Rock Name

What is intermediate composition of rock?

Intermediate rocks are roughly even mixtures of felsic minerals (mainly plagioclase) and mafic minerals (mainly hornblende, pyroxene, and/or biotite). There is little or no quartz. Felsic rocks are mostly feldspar (especially K-feldspar), at least 10% quartz, and less than 15% mafic minerals (biotite, hornblende).

What type of rock is pyroxene?

General considerations. Pyroxenes are the most significant and abundant group of rock-forming ferromagnesian silicates. They are found in almost every variety of igneous rock and also occur in rocks of widely different compositions formed under conditions of regional and contact metamorphism.

Is pyroxene a feldspar?

They are most abundant in the dark-colored igneous rocks, such as basalt and gabbro, that comprise most of the oceanic crust. Pyroxenes and plagioclase feldspar are the most abundand minerals in these rocks….

Physical Properties of Pyroxenes
Chemical Classification Silicate
Mohs Hardness 5 to 7
Specific Gravity 3 to 4

What are coarse grained rocks?

(a) Said of a crystalline rock, and of its texture, in which the individual minerals are relatively large; specif. said of an igneous rock whose particles have an average diameter greater than 5 mm (0.2 in.).

What are intermediate igneous rocks?

Igneous Rocks by Composition Intermediate rocks are roughly even mixtures of felsic minerals (mainly plagioclase) and mafic minerals (mainly hornblende, pyroxene, and/or biotite). There is little or no quartz.

What rocks are intermediate?

Intermediate rocks are grey in color and contain somewhat equal amounts of minerals that are light and dark in color. Primary intermediate rocks are andesite (extrusive) and diorite (intrusive).

What is a coarse grained rock?

(a) Said of a crystalline rock, and of its texture, in which the individual minerals are relatively large; specif. said of an igneous rock whose particles have an average diameter greater than 5 mm (0.2 in.).

What igneous rocks are intermediate?

Typical intermediate rocks include andesite, dacite and trachyandesite among volcanic rocks and diorite and granodiorite among plutonic rocks.

Which rock contains feldspar?

What is Feldspar? Feldspar is the name of a large group of rock-forming silicate minerals that make up over 50% of Earth's crust. (1) They are found in igneous, metamorphic, and sedimentary rocks in all parts of the world. Feldspar minerals have very similar structures, chemical compositions, and physical properties.

Does basalt have pyroxene?

Basalts are common aphanitic igneous extrusive rocks composed of minute grains of Plagioclase feldspar (Labradorite), Pyroxene, Olivine, Biotite, Hornblende, and less than 20% Quartz.

What rocks contain pyroxene?

In Earth's crust, pyroxenes are found in a wide range of igneous and metamorphic rocks. They are most abundant in the dark-colored igneous rocks, such as basalt and gabbro, that comprise most of the oceanic crust. Pyroxenes and plagioclase feldspar are the most abundand minerals in these rocks.

What rock is pyroxene found in?

Minerals in the pyroxene group are abundant in both igneous and metamorphic rocks. Their susceptibility to both chemical and mechanical weathering makes them a rare constituent of sedimentary rocks. Pyroxenes are classified as ferromagnesian minerals in allusion to their high content of magnesium and iron.

What are coarse grained igneous rocks?

(a) Said of a crystalline rock, and of its texture, in which the individual minerals are relatively large; specif. said of an igneous rock whose particles have an average diameter greater than 5 mm (0.2 in.).

What are examples of intermediate rocks?

Typical intermediate rocks include andesite, dacite and trachyandesite among volcanic rocks and diorite and granodiorite among plutonic rocks.