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Gabbro (/ˈɡæbroʊ/ GAB-roh) is a
phaneritic (co****-grained and magnesium- and iron-rich),
mafic intrusive igneous rock
formed from the slow
cooling magma...
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Hornblende gabbro is an
intrusive rock
similar to
normal gabbro (
gabbro sensu stricto). In the QAPF
classification it
falls within the
gabbro field, in...
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Mountain Gabbro Group, the
other being the Glen
Mountain Layered Complex. The
Roosevelt Gabbros are
generally characterized as
biotite gabbros,
which form...
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Quartz gabbro is an
intrusive rock with a
composition intermediate between gabbro and tonalite. It is
defined in the QAPF
classification as co****-grained...
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Baltimore Gabbro Complex is a
hypersthene gabbro with
subordinate amounts of
olivine gabbro, norite,
anorthositic gabbro, and pyroxenite.
Igneous minerals...
- Nepheline-bearing
gabbro is an
intrusive rock with a
composition intermediate between gabbro and
nepheline gabbro. It is
defined in the QAPF classification...
-
portion of this unit,
named the Glen
Mountains Layered Complex,
consists of
gabbro,
anorthosite and troctolite.
Recent high-precision
dating yields an age...
- diorites,
whereas ores of
chromium and
platinum are
commonly ****ociated with
gabbros.
Igneous rocks can be
either intrusive (plutonic and hypabyssal) or extrusive...
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Gabbro Peak is an 11,033-foot-elevation (3,363-meter)
mountain summit located in the
Sierra Nevada mountain range, in Mono
County of
northern California...
- amphibole, and biotite.
Common mafic rocks include basalt,
diabase and
gabbro.
Mafic rocks often also
contain calcium-rich
varieties of
plagioclase feldspar...
