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Peridotite, a type of ultramafic rock. Ultramafic rocks (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are usually composed of greater than 90% mafic minerals (dark colored, high magnesium and iron content).
Pages in category "Ultramafic rocks" The following 15 pages are in this category, out of 15 total. This list may not reflect recent changes. ...
Lherzolite – an ultramafic and ultrabasic rock that is composed of olivine and pyroxene – An ultramafic rock, essentially a peridotite Monzodiorite – igneous rock Pages displaying wikidata descriptions as a fallback An intrusive igneous rock intermediate in composition between diorite and monzonite
List of rock types – List of rock types recognized by geologists; Igneous rock – Rock formed through the cooling and solidification of magma or lava; Rock microstructure – Relationship between materials which compose a rock; Komatiitic Ni-Cu-PGE mineralisation – Fe-Ni-Cu-PGE ore deposit; Ultramafic rock – Type of igneous and meta ...
A massive exposure of dunite in the United States can be found as Twin Sisters Mountain, near Mount Baker in the northern Cascade Range of Washington. In Europe it occurs in the Troodos Mountains of Cyprus. In southern British Columbia, Canada dunite rocks form the core of an ultramafic rock complex located near the small community of Tulameen.
[1] [2] Although most are ultramafic to mafic in composition, the Ilimaussaq intrusive complex of Greenland is an alkalic intrusion. [3] Layered intrusions are typically found in ancient cratons and are rare but worldwide in distribution.
Rock art found in southeastern Venezuela may have come from a previously unknown culture. Researchers believe that the roughly 4,000-year-old art signifies a central dispersion point from which ...
The Kimberley diamonds were originally found in weathered kimberlite, which was colored yellow by limonite, and so was called "yellow ground". Deeper workings encountered less altered rock, serpentinized kimberlite, which miners call "blue ground". Yellow ground kimberlite is easy to break apart and was the first source of diamonds to be mined.