Pyroxenes are a major group of rock-forming minerals characterized by their crystal structure, which typically includes a single chain of octahedral silicate units. These minerals are common components of igneous, metamorphic, and sedimentary rocks found globally. Their chemical composition is highly variable but generally falls within the formula (Mg, Fe)SiO₃. Different pyroxene members exhibit variations in their chemical stoichiometry, influencing properties such as density, color, and hardness. Geologically, pyroxenes are crucial indicators of the physical conditions—such as temperature and pressure—under which the parent rocks crystallized or were altered.