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CaSiO is not a single, well-defined chemical compound but a shorthand used to indicate calcium–silicon–oxygen compositions. In practice, it refers to calcium silicate oxides and solid solutions in the Ca–Si–O system, where the exact Ca:Si:O ratio can vary. The term is often encountered in discussions of materials design, mineralogy, and cement chemistry rather than as a discrete molecular species.

Natural occurrence: The most common calcium silicate mineral is wollastonite, with the idealized formula CaSiO3. Other calcium silicate minerals include phases such as larnite (Ca2SiO4). In rocks and metamorphic environments, these minerals form through high-temperature reactions between calcium-rich rocks and silica-bearing fluids or melts and can influence rock texture and porosity.

Industrial and technological relevance: Calcium silicate materials play a central role in construction and refractories. In cement chemistry, calcium silicate phases such as those represented by 2CaO·SiO2 and 3CaO·SiO2 are fundamental to cement hydration and strength development; these are commonly referred to by shorthand notations in cementology. Beyond cement, calcium silicate compounds are used in thermal insulation products, ceramics, and coatings, where their thermal stability and refractory properties are advantageous.

Chemistry and terminology: CaSiO-related discussions often emphasize the variability of composition within the Ca–Si–O system, rather than a fixed stoichiometric compound. Wollastonite and related calcium silicates illustrate the natural and engineered manifestations of CaSiO-like compounds, while research on CaSiO-containing materials continues to explore phase relations, nonstoichiometry, and applications in high-temperature environments.