If olivine is present, it shows the dark olivine layers as well. It is very similar to the fast cooling, extrusive basalt, as they both are formed from mafic magmas that contain dark-colored minerals such as pyroxene, plagioclase, amphibole, and olivine. Gabbro is sometimes called “black granite” for it too is coarse-grained, but a large proportion of iron-bearing minerals make gabbro heavier and dark colored. Gabbro can be formed as a massive intrusion by crystallization of pyroxene and plagioclase, or as alternating light plagioclase feldspar and dark clinopyroxene layer. It generally occurs as batholiths and laccoliths and is often found along mid-ocean ridges or in ancient mountains composed of compressed and uplifted oceanic crust. Gabbro is a medium-grained, ultramafic igneous rock. Gabbro can also be gray or light green. Gabbro Gabbro is a dense, mafic intrusive rock. Gabbro (/ ˈ É¡ æ b r oʊ /) is a phaneritic (coarse-grained), mafic intrusive igneous rock formed from the slow cooling of magnesium-rich and iron-rich magma into a holocrystalline mass deep beneath the Earth's surface. The presence of gabbro in North Carolina is evidence of the divergent boundary that once caused ancient supercontinents to split up. Long belts of gabbroic intrusions are typically formed at proto-rift zones and around ancient rift zone margins, intruding into the rift flanks. Gabbro is a typically dark colored, large-crystal igneous rock that forms from the slow cooling and crystallization of magmas below the Earth's surface. How did it form? Gabbro Formation. There are a variety of Gabbro Uses and the Gabbro Reserves are found in many countries around the world. Gabbro formation took place millions of years ago. A thin layer of rocks at or above the oceanic crust are the basalts. Gabbro Composition. Gabbro is a strange name that most people aren't familiar with, much less how it is formed. Gabbro is an essential part of the oceanic crust, and can be found in many ophiolite complexes as parts of zones III and IV (sheeted dyke zone to massive gabbro zone). Gabbro is widely used as crushed stone for concrete aggregate, road base material, and railroad ballast. Gabbro is the plutonic equivalent of basalt. It is made up of plagioclase feldspar and pyroxene. Definition – Gabbro (/ˈɡæbroʊ/) is a phaneritic (coarse-grained), is an intrusive igneous rock that forms from the result of slow cooling of magma inside of a volcano. Gabbro is a coarse-grained igneous rock that forms when iron-rich magma cools slowly deep within the Earth. Gabbro is an intrusive igneous rock, meaning that it forms from the solidification of magma within the earth.Intrusive igneous rocks are medium- to coarse-grained because they cool slowly over time. Gabbro is a large group of dark, mafic igneous rocks that are chemically similar to basalt. Mafic magmas, formed in Earth’s upper mantle, sometimes contain significant amounts of periodot, garnet (grossular), and diamond known to form at great depths. Gabbro, any of several medium- or coarse-grained rocks that consist primarily of plagioclase feldspar and pyroxene.Essentially, gabbro is the intrusive (plutonic) equivalent of basalt, but whereas basalt is often remarkably homogeneous in mineralogy and composition, gabbros are exceedingly variable.Gabbros are found widely on the Earth and on the Moon as well. The rocks in the earth’s crust continuously undergo changes in their composition which leads to formation of other rocks. At 1200°C, the first stage of crystallization, minerals such as olivine, feldspar, pyroxene, and spinel typically develop and make up a common kind of igneous rock called gabbro. 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