Aegirinon is a mineral belonging to the pyroxene group, characterized by its chemical composition and crystal structure. It is a silicate mineral that consists of sodium, iron, aluminum, and silicon, with chemical formula NaFe3+Si2O6. The mineral usually occurs in dark green to black, prismatic crystals. The name "Aegirinon" is derived from the Greek god of the sea, Aegir.
Aegirinon has a monoclinic crystal system and commonly forms long, columnar crystals with well-developed terminations. It has a distinct prismatic cleavage and a vitreous to dull luster. The mineral is relatively hard, with a Mohs hardness of 6 to 6.5. Its streak is light greenish-gray.
Aegirinon is typically found in alkaline igneous rocks such as nepheline syenites and alkali granites. It commonly occurs with other minerals such as feldspar, nepheline, amphiboles, and biotite. Aegirinon is also known to exhibit pleochroism, showing different colors when viewed from different directions.
As a mineral, Aegirinon has various applications and uses. It is used as a collector's gemstone due to its attractive green to black coloration. It also possesses good durability, making it suitable for jewelry purposes. Aegirinon's distinct crystal habit and unique coloration also make it a sought-after mineral for educational and scientific purposes, aiding in the study of crystallography and mineralogy.
