A coarse-grained, mafic, intrusive igneous rock formed by magma cooling slowly into a wholly crystalline mass deep beneath the surface. It has the same chemical composition and mineralogy as rapidly cooled, fine-grained basalt, and much of Earth's oceanic crust is made of it, formed at mid-ocean ridges; the dimension stone trade often sells it as black granite. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
Formation ClassIgneous, intrusive (slow cooling of magma into a holocrystalline mass deep beneath the surface) 1 Classification
Classification UseBuilding and Construction 1 Gabbro
Filter Results3 entries
Connections
Associated With
Gabbro has the same chemical composition and mineralogy as rapidly cooled, fine-grained basalt.
Source Gabbro (Wikipedia)
Chemically equivalent to coarse-grained plutonic gabbro; diabase is the subvolcanic (intermediate-depth) equivalent.
Source Diabase (Wikipedia)
Source Guiana Shield (Wikipedia)
Source St Kilda, Scotland (Wikipedia)
Source Zuma Rock (Wikipedia)
Classified As
In Discipline
Source Gabbro (Wikipedia)
Sources
1. Gabbro (Wikipedia)
Wikimedia FoundationLead section
Slow-cooling, coarse-grained gabbro has the same chemical composition and mineralogy as rapid-cooling, fine-grained basalt. Much of the Earth's oceanic crust is made of gabbro, formed at mid-ocean ridges.
Lead section
Gabbro ( GAB-roh) is a phaneritic (coarse-grained), mafic (magnesium- and iron-rich), intrusive igneous rock formed from the slow cooling magma into a holocrystalline mass deep beneath the Earth's surface. Slow-cooling, coarse-grained gabbro has the same chemical composition and mineralogy as rapid-cooling, fine-grained basalt.
Article text
It is often called "black granite" commercially, just as other intrusive rocks are called "granite" in the dimension stone industry.
View the Source 2. Geology.com: Gabbro
Geology.comDescription
It is the most abundant rock in the deep oceanic crust.
Article text
It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite.
Article text, rarity
It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite. It is the most abundant rock in the deep oceanic crust.
Article text, colour-category
Gabbro is a coarse-grained, dark-colored, intrusive igneous rock . It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite.
View the Source Wikidata: Gabbro
Wikidata Q46947
Diabase (Wikipedia)
Wikimedia FoundationAssociated With: Diabase, Lead sectionQuote, Associated With: Diabase, Lead section
Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock chemically equivalent to volcanic basalt or plutonic gabbro.
Zuma Rock (Wikipedia)
Associated With: Zuma Rock, Lead paragraph
Zuma Rock is a large natural monolith, or inselberg, an igneous intrusion composed of gabbro and granodiorite and of Precambrian age, located in Madalla, a town in Niger State, Nigeria.
Associated With: Zuma Rock, Lead, rock Gabbro
Zuma Rock is a large natural monolith, or inselberg, an igneous intrusion composed of gabbro and granodiorite and of Precambrian age, located in Madalla, a town in Niger State, Nigeria.
View the SourceGuiana Shield (Wikipedia)
Associated With: Guiana Shield, Lead, rock GabbroQuote, Associated With: Guiana Shield, Lead, rock Gabbro
The rocks of the Guiana Shield consist of metasediments and metavolcanics (greenstones) overlain by sub-horizontal layers of sandstones, quartzites, shales and conglomerates intruded by sills of younger mafic intrusives such as gabbros.
St Kilda, Scotland (Wikipedia)
Associated With: St Kilda, Scotland, Article text, rock GabbroQuote, Associated With: St Kilda, Scotland, Article text, rock Gabbro
The islands are composed of Tertiary igneous formations of granites and gabbro, heavily weathered by the elements.
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