A name originally given by the Italians to a kind of serpentine, later to the rock called euphotide, and now generally used for a coarsely crystalline, igneous rock consisting of lamellar pyroxene (diallage) and labradorite, with sometimes chrysolite (olivine gabbro).
a coarse grained, basic (low in SiO2) plutonic (deep intrusiv e) igneous ro ck, often olivine-bearing.
A coarsely crystalline igneous rock composed mainly of limesoda feldspar, pyroxene, amphibole, and frequently olivine. Accessory minerals are magnetite or ilmenite or both and apatite. Generally dark colored. Ferromagnesium minerals are generally more abundant than feldspar. A coarse grained equivalent of basalt.
is an intrusive rock comprised of a mixture of mafic minerals and feldspars
Dark-colored intrusive igneous rock composed principally of plagioclase and clinopyroxene, with or without olivine and orthopyroxene. It is the intrusive equivalent of basalt.
A black, coarse-grained intrusive igneous rocks that is the compositional equivalent of basalt. Composed of calcium-rich feldspars, pyroxene and possibly olivine, but containing little if any quartz.
A dark, coarse-grained intrusive igneous rock. Gabbro is made of calcium-rich plagioclase, with amphibole and/or pyroxene, and is chemically equivalent to basalt.
A dark-colored, coarse-grained rock composed of Ca-plagioclase, pyroxene, and possibly olivine, but no quartz.
Intrusive igneous rock, green to blackish in colour, mottled white in varying degrees.
Subject: The Earth A mafic, coarse-grained, plutonic igneous rock consisting mainly of Ca-plagioclase feldspar, pyroxene and possibly olivine, but no quartz. Gabbros form from the slow crystallization of magma, which is basaltic in composition. [ Pics List
coarse-textured igneous rock.
A coarse-grained igneous rock consisting of feldspar and magnesium- and iron-rich silicate minerals, including pyroxene and sometimes olivine.
A group of dark-colored igneous rocks composed primarily of the minerals plagioclase feldspar and clinopyroxene, with minor orthopyroxene.
A black, coarse-grained, intrusive igneous rock, composed of calcic feldspars and pyroxene; the intrusive equivalent of basalt.
Coarse grained igneous rock with composition similar to basalt.
one of a family of granular intrusive rocks
A basic volcanic igneous rock that develops from mafic magma and whose mineral crystals are coarse. Mineralogically this rock is identical to basalt.
It is a coarse-grained mafic igneous rock which consists of plagioclase feldspar and pyroxene. Olivine, sometimes also forms a major constituent. Other minor one are hornblende, biotite, quartz, magnetite and ilmenite.
(geology): A dark, coarse-grained rock, consisting of the minerals calcium, feldspar and crystals of the pyroxene group. The Bushveld Complex is largely norite, a type of gabbro, and contains the majority of South Africa's chromium, platinum and magnetite ores.
Any of a group of dark, dense, phaneritic, intrusive rocks that are the plutonic equivalent to basalt.
A course-grained rock common in plutonic intrusions poor in quartz and silica.
dark-coloured, coarse-grained, intrusive igneous rock composed of calcium-rich feldspar, pyroxene and sometimes olivine; it is the deep intrusive equivalent of basalt and diabase.
a mafic (dark-colored), coarse-grained, intrusive igneous rock. It is the approximate intrusive equivalent of basalt and normally contains easily-seen plag-ioclase feldspar crystals in the shape of elongate, reflective laths with fine lines running parallel to the long lengths of the plagioclase laths. Blocky material around the plagioclase laths usually is greenish-black augite.
coarse-grained igneous rock containing minor silica
Subject: rock Dark, medium- to coarse-grained, intrusive mafic igneous rock, commonly massive-appearing, generally lacking layering or banding; composed primarily of clinopyroxene and plagioclase; often altered.equivalent of basalt or diabase.[ Pics List
highly mafic igneous plutonic rock, typically dark in colour; rough plutonic equivalent of basalt.
A coarse grained basic igneous rock. The crystals are large as a result of the magma cooling and crystallising slowly deep underground. Gabbro is the basic equivalent of the acid granite.
A coarse grained intrusive rock, which is low in silica and has relatively high levels of iron and magnesium minerals.
a course-textured igneous rock.
Plagioclase (Calcium-rich) feldspar about 50%, mafic minerals about 50
plutonic, melanocratic, granular rock, composed of calcic plagioclase, pyroxene and peridot.
A coarse-grained, mafic intrusive rock composed mainly of the minerals plagioclase, pyroxene and olivine
a coarse-grained igneous rock typically composed of pyroxene and plagioclase feldspar.
A dark igneous rock of coarse grain size, which is relatively rich in iron and magnesium minerals.
1) A dark, massive rock with crystals large enough to be seen with the naked eye. This igneous rock formed from magma flowing up and cooling slowly below the surface. It is the intrusive equivalent of the extrusive basalt, which would form if the same magma cooled on the surface. 2) A large lake on the lower Kawishiwi River.
A dark-colored intrusive igneous rock that consists mostly of the minerals plagioclase, pyroxene, and olivine. Gabbro has a similar composition to basalt, which is extrusive. Both gabbro and basalt are mafic rocks, composed of minerals high in iron and magnesium.
Gabbro (IPA: ) is a dark, coarse-grained, intrusive igneous rock chemically equivalent to basalt. It is a plutonic rock, formed when molten magma is trapped beneath the Earth's surface and cools into a crystalline mass.