Piroxienitiä

Piroxienitiä is a rare intrusive igneous rock that is primarily composed of pyroxene minerals. Typically, it is a dark-colored rock, often appearing black or very dark green, due to the abundance of pyroxene. The texture of piroxienitiä is usually coarse-grained, meaning the individual mineral crystals are large enough to be seen with the naked eye. These crystals are commonly euhedral or subhedral, indicating they had space to grow as they formed.

The formation of piroxienitiä occurs deep within the Earth's crust or upper mantle under conditions of high pressure and temperature. It solidifies from a molten magma that is rich in magnesium and iron. The specific mineralogy can vary, but common pyroxenes found in piroxienitiä include orthopyroxenes like enstatite and ferrosilite, and clinopyroxenes such as augite. Other accessory minerals might be present in smaller amounts, such as olivine, plagioclase feldspar, or spinel.

Piroxienitiä is often found in association with other ultramafic rocks, like peridotites, and can occur as dikes, sills, or larger intrusive bodies. Due to its rarity and deep-seated origin, outcrops of piroxienitiä are uncommon. When found, they are of interest to geologists for understanding the composition and processes occurring in the Earth's mantle. Its dense nature and dark color distinguish it from more common igneous rocks.