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Peridotite
gale
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Peridotite
Peridotite is a dark-colored, coarse-grained igneous rock believed by many scientists to be the primary rock of the exterior of Earth's mantle. The rock typically forms in volcanic pipes and is forced to the surface from great depths during a volcanic eruption.
Peridotite consists of a dense iron and magnesia mineral called olivine , as well as pyroxenes and a small amount of feldspar . It is a pistachio-green color when fresh, but weathering creates iron oxides that turn it a medium brown. The iron and magnesia-rich rock is the most common host for naturally occurring diamonds. South African diamonds are obtained from a mica-rich form of peridotite called kimberlite. Periodite is also a source of valuable ores and minerals including chromite, platinum, nickel, and precious garnet. In rare instances, individual olivine crystals in periodite are large enough and pure enough to be designated a gem. The resulting gem is a semi-precious mineral called peridot.
Periodite is found worldwide, but particularly in New Zealand.
Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).
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peridotite
oxford
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peridotite Heavy igneous rock of coarse texture composed of olivine and pyroxene with small flecks of mica or hornblende. It alters readily into serpentine.
World Encyclopedia
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Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).
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