what type of rock is gabbro

Gabbro 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 Earths surface. It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite. Gabbro is relatively low in silica and rich in iron, magnesium, and calcium, and it is composed of pyroxene and calcium-rich plagioclase, with minor amounts of hornblende, olivine, and accessory minerals. Gabbro is the intrusive equivalent of basalt, and it is the most abundant rock in the deep oceanic crust. It is found widely on Earth and on the Moon as well. Gabbro is used for various purposes in the construction industry, from crushed stone base materials at construction sites to polished stone countertops and floor tiles. Due to its variant nature, the term gabbro may be applied loosely to a wide range of intrusive rocks, many of which are merely "gabbroic".