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Peridotite (US: /ˈpɛrɪdoʊˌtaɪt, pəˈrɪdə-/ PERR-ih-doh-tyte, pə-RID-ə-) is a dense, co****-grained
igneous rock
consisting mostly of the
silicate minerals...
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Ronda peridotite is a 300-square-kilometre (120 sq mi)
peridotite body in
Betic Cordillera,
southern Spain. List of ophiolites:
Mediterranean and Peri-Arabic...
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primarily of
basalt and gabbro. Both
continental and
oceanic crust rest on
peridotite of the mantle.[citation needed]
Rocks may melt in
response to a decrease...
- Harzburgite, an ultramafic,
igneous rock, is a
variety of
peridotite consisting mostly of the two
minerals olivine and low-calcium (Ca)
pyroxene (enstatite);...
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Peridot can be
found in
mafic and
ultramafic rocks occurring in lava and
peridotite xenoliths of the mantle. The gem
occurs in silica-deficient
rocks such...
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which they crystallized. The
ultramafic intrusives include the dunites,
peridotites and pyroxenites.
Other rare
varieties include troctolite which has a...
- the Mohorovičić
discontinuity or "Moho". The
upper mantle is
dominantly peridotite,
composed primarily of
variable proportions of the
minerals olivine, clinopyroxene...
- and norites, from
which they
differ by the
absence of feldspar, and to
peridotites,
which are
distinguished from them by
containing more than 40% olivine...
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spinels and garnets.
Plagioclase can
occur in
lherzolites and
other peridotites that
crystallize at
relatively shallow depths (20 – 30 km). At greater...
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Dunite is the olivine-rich
endmember of the
peridotite group of mantle-derived rocks.
Dunite and
other peridotite rocks are
considered the
major constituents...
