noun Mineralogy.
- a yellow-green fibrous magnesium silicate, an orthorhombic pyroxene found in norites containing less than five percent ferrous oxide.
noun
- a grey, green, yellow, or brown pyroxene mineral consisting of magnesium silicate in orthorhombic crystalline form. Formula: Mg 2 Si 2 O 6
- A glassy, usually yellowish gray orthorhombic variety of pyroxene. It is usually found in igneous rocks and meteorites. Chemical formula: Mg2Si2O6.