unlayered gabbroic complex

An unlayered gabbroic complex is a type of intrusive igneous rock formed from magma that cools slowly beneath the Earth's surface. Gabbro is primarily composed of plagioclase feldspar and pyroxene. Unlike basalt, which is its extrusive equivalent, gabbro can be highly variable in its mineralogy and composition.12

While some gabbroic complexes exhibit distinct layering, unlayered complexes are characterized by a lack of regular banding. These can appear streaky and inhomogeneous. Segregations, which are concentrations of specific minerals, can also be found within gabbroic rocks. Although gabbro has minor direct economic value as dimension stone, it is significant for its association with primary mineralizations of nickel, chromium, and platinum.23