Gabbro

• • Summary of Gabbro**

Gabbro is a coarse-grained plutonic rock primarily composed of pyroxene and plagioclase feldspar minerals, classifying it as an intermediate to mafic igneous rock. It exhibits various types based on mineral content, such as olivine gabbro and clinopyroxene gabbro, each with distinct textures like equigranular or ophitic.

Formed through the crystallization of mafic magma, gabbro is typically found in plutonic settings or as part of layered intrusions, often referred to as adcumulate. It is more prevalent in oceanic crust and ophiolites rather than continental crust. Notable examples include the Bushveld Complex and other significant geological formations.

Gabbro holds economic value due to its mineral content, including platinum, chromium, and others, though its hardness limits extensive use beyond construction materials like black granite. Additionally, indigo gabbro from Madagascar is utilized as a semi-precious stone. Its relation to other rocks such as peridotite and differences from diabase are also worth noting.

In summary, gabbro's composition, varied types, formation processes, geological distribution, and economic uses provide a comprehensive understanding of this igneous rock.