What is the density of peridotite?
between 3.2 – 3.4 g/cm3
Peridotite and Dunite are more dense than crustal rocks (with average densities between 3.2 – 3.4 g/cm3).
Why peridotite is the densest among igneous rocks?
ə-/ PERR-ih-doh-tyte, pə-RID-ə-) is a dense, coarse-grained igneous rock consisting mostly of the silicate minerals olivine and pyroxene. Peridotite is ultramafic, as the rock contains less than 45% silica. It is high in magnesium (Mg2+), reflecting the high proportions of magnesium-rich olivine, with appreciable iron.
Is peridotite denser than iron?
For example, the density of a one-inch cube of iron is much greater than the density of a one-inch cube of cotton. In most cases, denser objects are also heavier….Rock Densities.
| Rock | Density |
|---|---|
| Marble | 2.4–2.7 |
| Mica schist | 2.5–2.9 |
| Peridotite | 3.1–3.4 |
| Quartzite | 2.6–2.8 |
How do you find the density of a rock?
Divide the mass of the rock by its volume to calculate the density of the rock. In our example, the density is 20.4/8 = 2.55 g/cubic cm. Divide the rock density by the density of water to calculate the specific gravity.
What is peridotite rock?
Peridotite is the general name for the ultrabasic or ultramafic intrusive rocks, dark green to black in color, dense and coarse-grained texture, often as layered igneous complex.
Which igneous rock has highest density?
The correct answer is Basalt. Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals.
What is characteristics 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.
Is peridotite a mineral or a rock?
Igneous Rock
Peridotite
| Type | Igneous Rock |
|---|---|
| Chemical Composition | Ultramafic |
| Color | Medium Green |
| Mineral Composition | Olivine |
| Miscellaneous | Also called “Dunite” |
What is bulk density of rock?
In rock: Density. The bulk density of a rock is ρB = WG/VB, where WG is the weight of grains (sedimentary rocks) or crystals (igneous and metamorphic rocks) and natural cements, if any, and VB is the total volume of the grains or crystals plus the void (pore) space.…
What is the specific gravity of peridotite?
5. Peridotite is a compact dark greenish rock with a specific gravity of 2.781.
What igneous rock has a density less than water?
Pumice stone
A quick way of describing density is to describe an object as heavy or light for its size. Pumice stone, unlike regular rock, does not sink in water because it has a low density. Pumice stone is igneous rock formed when lava cools quickly above ground (lava froth).
What is the average density of rocks?
between 2.6 and 2.7g/cc
Remarks. Most of the rocks comprising the crust of the earth have density between 2.6 and 2.7g/cc.
What texture is peridotite rock?
coarse-grained texture
Peridotite is the general name for the ultrabasic or ultramafic intrusive rocks, dark green to black in color, dense and coarse-grained texture, often as layered igneous complex.
Where is peridotite rock found?
Some of the occurrences of peridotite on Earth’s surface are thought to be rocks from the mantle that have been brought up from depth by deep-source magmas. Ophiolites and pipes are two structures that have brought mantle peridotite to the surface. Peridotite is also found in the igneous rocks of sills and dikes.
What is density in rocks?
Density is the term for how heavy an object is for its size. Rock density is usually expressed in units like grams per cubic centimeter (g/cc or g/cm3), kilograms per cubic meter, or pounds per cubic inch (cubic foot or cubic yard).
How do you calculate a density of a rock?
What is density of a rock?
How big is a peridotite?
Peridotite: The specimen shown is about two inches (five centimeters) across. The peridotite “family” contains a number of different intrusive igneous rocks. These include lherzolite, harzburgite, dunite, wehrlite, and kimberlite (see photos).
Is peridotite a mineral resource?
The rocks that are called peridotites are therefore often heavily metamorphosed and should be called serpentinite instead of peridotite which it once was. This rock itself is usually not a notable mineral resource (see the exception from Norway below), but valuable stuff may be associated with it.
How do geologists find peridotites?
Geologists have located peridotite bodies by prospecting for chromite, garnet, and other resistant indicator minerals. When scattered by the action of water, wind, or ice, they will be most highly concentrated near the pipe and be diluted by local rock debris with distance.
What are peridotite xenoliths?
Among the rocks that commonly include peridotite xenoliths are basalt and kimberlite. Certain volcanic rocks, sometimes called komatiites, are so rich in olivine and pyroxene that they also can be termed peridotite.