Gabbro: Igneous Rock - Pictures, Definition & More - Geology.com
网页What is Gabbro? 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. It is the most abundant rock in the deep oceanic crust. Gabbro has a variety of uses in the construction industry.
Gabbro - Wikipedia
网页Gabbro (/ ˈɡæbroʊ / GAB-roh) is a phaneritic (coarse-grained and magnesium- and iron-rich), mafic intrusive igneous rock formed from the slow cooling magma into a holocrystalline mass deep beneath the Earth 's surface. Slow-cooling, coarse-grained gabbro is chemically equivalent to rapid-cooling, fine-grained basalt.
Gabbro Rocks: Identification, Characteristics, Pictures, and More
网页2024年4月11日 · Gabbro, a rock formed through the slow crystallization of molten magma deep within the Earth’s crust, exhibits specific characteristics that aid in its identification. Here are some tips to help you identify gabbro rocks: Color: Gabbro commonly appears dark green to black, but it can also display shades of gray. The color intensity can vary ...
Gabbro | Properties, Formation, Composition, Uses - Geology …
网页2023年9月4日 · Gabbro is a type of intrusive igneous rock that is coarse-grained and dark-colored, typically composed of calcium-rich plagioclase feldspar, pyroxene, and sometimes olivine. It is similar in composition to basalt, which is its extrusive equivalent.
Pictures and Descriptions of Igneous Rock Types - ThoughtCo
网页2019年6月2日 · Gabbro is a dark-colored igneous rock that is considered to be the plutonic equivalent of basalt. Unlike granite, gabbro is low in silica and has no quartz. Also, gabbro has no alkali feldspar, only plagioclase feldspar with a high calcium content.
Gabbro: Identification, Pictures & Info for Rockhounds
网页Gabbro is an intrusive igneous rock composed primarily of plagioclase feldspar and large amounts of mafic minerals like pyroxene. It has a phaneritic texture, meaning its interlocking crystals can be seen with the naked eye. It is usually dark gray, black, or dark greenish, and is closely related to basalt.
Gabbro | Igneous Rock, Mafic Minerals & Plutonic Intrusions
网页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.
Gabbro: A Coarse-grained, Dark-Colored Plutonic Rock
网页2023年7月21日 · Usually, gabbro is a tough, massive, or layered dark gray, dark green, or black rock with a coarse-grained texture. It has equigranular hypidiomorphic grains with a somewhat speckled appearance characterized by mostly darker minerals (mafic) and fewer lighter minerals ( felsic ).
Gabbro - Minerals Education Coalition
网页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 also be gray or light green. Gabbro is widely used as crushed stone for concrete aggregate, road base material, and railroad ballast.
Gabbro - Igneous rocks - Sandatlas
网页Gabbroic rocks are usually equigranular (composed of similarly sized grains) mixtures of black, brown or greenish pyroxene and white, gray, or greenish plagioclase. Pyroxenite and other ultramafic rocks are darker- and diorite is lighter-colored.