Augite is a rock-forming mineral that commonly occurs in mafic and intermediate igneous rocks such as basalt, gabbro, andesite, and diorite. It is found in these rocks throughout the world, wherever they occur. Augite is also found in ultramafic rocks and in some metamorphic rocks that form under high temperatures.

During granulite facies metamorphism under fluid-absent conditions, a reaction grew garnet at the interface between augite, which supplied Fe, Mg, and Ca, and plagioclase, which supplied Ca, Al, and most of the Si.

It’s also present in some metamorphic rocks like gneiss or schist. In terms of rarity, it is not considered rare as it can be found all over the world. The largest deposits are located in Canada, Russia, and China but smaller amounts have been discovered in many different countries including Mexico, India, Italy, and Australia.

Aug 26, 2023 · Schist is a type of metamorphic rock characterized by its foliated texture, which means it possesses distinct layers or bands of minerals that have undergone significant physical and chemical changes due to heat, pressure, and other geological processes.

Augite, also known as Augurite, is a common rock-forming pyroxene mineral with formula (Ca,Na) (Mg,Fe,Al,Ti) (Si,Al)2O6. The crystals are monoclinic and prismatic. Augite has two prominent cleavages, meeting at angles near 90 degrees. Augite is a solid solution in the pyroxene group.

Mar 15, 2019 · Augite occurs chiefly as short, thick, prismatic crystals with a square or octagonal cross section and sometimes as large, cleavable masses. It occurs in a solid-solution series in which diopside and hedenbergite are the end-members.

Augite is a clinopyroxene. Clinopyroxenes and orthopyroxenes are easily distinguished in thin section by their extinction angles: clinopyroxenes have inclined extinction, and orthopyroxenes have parallel extinction.

Augite is a very common rock-forming mineral that gives black color to many igneous rocks. This mineral belongs to a group of silicate minerals known as pyroxenes. By the way, ‘pyroxene’ comes from the Greek language and means that these minerals have nothing to do with fire (i.e. igneous processes).

The augite- porphyroclastic schist is fine-to medium-grained and consists of clinopyroxene, plagioclase and minor amphibole and opaque minerals. Augite- porphyroclasts are up to 8 mm in diameter...

They contain quartz, one or more varieties of feldspar, and usually mica, hornblende or augite, often garnet, iron oxides, and so forth. Hence, in composition they resemble granite, differing principally in their foliated structure.