Ca2Si2O6

Ca2Si2O6 is the chemical formula for a compound belonging to the pyroxene group of minerals. Specifically, it represents the ideal composition of diopside, a calcium magnesium silicate. Diopside is a common mineral found in various geological settings, including metamorphic rocks like skarns and marbles, as well as in some igneous rocks such as basalts and kimberlites. Its crystal structure is characterized by single chains of silica tetrahedra linked by calcium and magnesium cations. Diopside typically forms monoclinic crystals and can range in color from colorless to green, brown, or black depending on the presence of impurities. It is known for its vitreous luster and relatively low hardness on the Mohs scale. While Ca2Si2O6 is the ideal formula, naturally occurring diopside often exhibits solid solution with other pyroxenes, meaning its composition can vary. For example, it can incorporate iron, aluminum, and other elements, leading to a range of compositions with slightly different properties.