what is peridotite?

What is peridotite rock?

peridotite, a coarse-grained, dark-coloured, heavy, intrusive igneous rock that contains at least 10 percent olivine, other iron- and magnesia-rich minerals (generally pyroxenes), and not more than 10 percent feldspar.

What is peridotite good for?

Peridotites are economically important rocks because they often contain chromite – the only ore of chromium; they can be source rocks for diamonds; and, they have the potential to be used as a material for sequestering carbon dioxide.

Where is peridotite mostly found?

Earth’s mantle
Peridotite is the dominant rock of the upper part of Earth’s mantle. The compositions of peridotite nodules found in certain basalts and diamond pipes (kimberlites) are of special interest, because they provide samples of Earth’s mantle brought up from depths ranging from about 30 km to 200 km or more.

What is characteristic of peridotite?

Peridotite is a very dense, coarse-grained, olivine-rich, ultra- mafic intrusive rock. It is noted for its low silica content, and contains very little or no feldspar ( orthoclase, plagioclase). It is a common component of oceanic lithosphere, and is derived from the upper mantle.

What is peridotite quizlet?

peridotite. A coarse-grained ultramafic intrusive igneous rock composed of olivine with small amounts of pyroxene and amphibole. The dominant rock in Earth’s mantle and the source rock of basaltic melts.

What is peridotite texture?

Texture. Phaneritic (Coarse-grained) Origin. Intrusive/Plutonic. Chemical Composition.

Is peridotite a felsic rock?

Compilations of many rock analyses show that rhyolite and granite are felsic, with an average silica content of about 72 percent; syenite, diorite, and monzonite are intermediate, with an average silica content of 59 percent; gabbro and basalt are mafic, with an average silica content of 48 percent; and peridotite is …

What is basalt the parent rock of?

Some metamorphic rocks form due to contact metamorphism, as a result of heat from a nearby intrusion of magma.

Foliated Metamorphic Rocks Crystal Size medium to coarse
Mineralogy biotite, muscovite, quartz, garnet, plagioclase
Parent Rock shale, basalt
Metamorphism medium grade regional
Rock Name schist

Is peridotite the same as peridot?

As nouns the difference between peridotite and peridot

is that peridotite is (geology|mineralogy) a rock consisting of small crystals of olivine, pyroxene and hornblende; the major constituent of the earth’s mantle while peridot is a transparent olive-green form of olivine, used as a gem.

Why is basalt important?

Basalt is used for a wide variety of purposes. It is most commonly crushed for use as an aggregate in construction projects. Crushed basalt is used for road base, concrete aggregate, asphalt pavement aggregate, railroad ballast, filter stone in drain fields, and may other purposes.

What type of rock is phyllite?


Type Metamorphic Rock
Texture Foliated; Fine-grained
Composition Muscovite, Biotite, Quartz, Plagioclase
Index Minerals
Color Shiny Gray

How is basalt formed?

Basalts are formed by the rapid cooling of basaltic lava, equivalent to gabbro-norite magma, from interior of the crust and exposed at or very close to the surface of Earth. These basalt flows are quite thick and extensive, in which gas cavities are almost absent.

What is the grain size of peridotite?

F-type peridotites are fine-grained (olivine, ∼60–70 µm across).

What is the specific gravity of peridotite?

5. Peridotite is a compact dark greenish rock with a specific gravity of 2.781.

Is peridotite magnetic?

Peridotite often has magnetic properties significantly different from surrounding rocks and a magnetic survey can be used to locate them.

What is basalt astronomy quizlet?

Basalt, a dense congealed lava rock rich in iron is the primary material in the Moon’s. Maria. One result of bombardment on the Moon’s surface is a layer of broken, pulverized, and powered rock called. Regolith.

Which three minerals are found in basalt quizlet?

Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill. It has a composition similar to gabbro.

When mantle peridotite partially melts what produces a magma?

Width of sample 16 cm. It is the source rock of basalt. Basaltic magma forms when peridotite is partially melted. Basalt and peridotite differ in composition because rocks are mixtures of minerals, but each mineral has its own melting temperature.

What texture is basalt?

Porphyritic Basalt

Type Igneous Rock
Texture Porphyritic
Origin Extrusive/Volcanic
Chemical Composition Mafic
Color Dark Gray to Black

Why is peridotite so dense?

Peridotite is a dense, coarse-grained igneous rock, consisting mostly of the minerals olivine and pyroxene. Peridotite is ultramafic and ultrabasic, as the rock contains less than 45% silica. It is high in magnesium, reflecting the high proportions of magnesium-rich olivine, with appreciable iron.

Is peridotite an andesitic?

The average composition of the continental crust is andesitic. Along with basalts, they are a major component of the Martian crust. The name andesite is derived from the Andes mountain range, where this rock type is found in abundance.


Secondary Magnetites, biotite, sphene, and quartz

What is a vesicular basalt?

Vesicular basalt is a dark-colored volcanic rock that contains many small holes, more properly known as vesicles. … Sometimes, vesicles can become filled in with secondary minerals, such as calcite, quartz, or zeolites. When vesicles are filled with such minerals, they are called amygdales.

Is Dunite a peridotite?

A dunite is an ultrabasic igneous rock dominated by essential olivine (>90% volume), often with accessory clinopyroxene, orthopyroxene, spinel, ilmenite, and magnetite. Dunite is usually coarse- to medium grained and is a peridotite.

Is basalt a sedimentary rock?

Basalt is not a sedimentary rock. It is actually an igneous rock formed from cooled, melted rocks.

Why are basaltic rocks dark?

Basalt is usually dark grey to black in colour, due to its high content of augite or other dark-coloured pyroxene minerals, but can exhibit a wide range of shading. … The physical properties of basalt reflect its relatively low silica content and typically high iron and magnesium content.

Where can I find basalt rocks?

It is found all over Earth, but especially under the oceans and in other areas where Earth’s crust is thin. It formed in the Isle Royale-Keweenaw region because of the Midcontinent Rift. Most of Earth’s surface is basalt lava, but basalt makes up only a small fraction of continents.

How much is peridotite worth?

How Much Is The Peridot Worth? In general, the Peridot price ranges approximately $50-$80 USD for the average size of 1 carat. The finest quality, top-color Peridots that are larger than 1 carat range steeper in price at $400-$450 USD.

What birthstone is November?

Colors of the November birthstone Topaz occurs in a range of magnificent colors: pale blue, pink, red, brown, varying shades of yellow, and even black. Pure topaz itself is a colorless stone.Nov 2, 2021

Is peridot the same as olivine?

Peridot (pronounced pair-a-doe) is the gem variety of olivine. Olivine, which is actually not an official mineral, is composed of two minerals: fayalite and forsterite. … The Arizona gem material is of lesser quality, but is far more abundant and is therefore much more affordable.

What minerals are in basalt?

what is peridotite?

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