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pyroxene
This term refers to a specific class of silicate minerals characterized by a single-chain structure. It is used primarily in geological and petrological contexts to describe the composition of igneous and metamorphic rocks, often serving as a diagnostic marker for the environment in which a rock formed.
As a mass noun representing a chemical group or mineral species, it is typically treated as uncountable when referring to the substance itself. To specify individual crystals or distinct types within the group, geologists use partitive constructions such as a grain of pyroxene or various species of pyroxene.