NaCa2Si3O8OH

NaCa2Si3O8OH is the chemical formula for a mixed sodium-calcium silicate bearing a hydroxide group. In mineralogical terms, it would represent a hydrated silicate phase in which Na+ and Ca2+ cations balance a polymerized silicate framework that includes one hydroxide (OH−) component. There is no widely established mineral species with this exact composition in major mineral databases, and the crystal structure and phase relations are not well defined in standard references.

Composition and structure

The formula contains one sodium ion, two calcium ions, three silicon atoms, and eight oxygens plus one hydroxide. In a hypothetical structure, SiO4 tetrahedra would polymerize to form a silicate network, with the hydroxide serving as a structural or interstitial component. Charge balance would be maintained by the Na+ and Ca2+ cations in the lattice. The precise arrangement of the ions and the topology of the silicate framework are not established in published data.

Occurrence and synthesis

There are no widely reported natural occurrences for this exact composition. If such a phase exists, it could potentially form under hydrothermal or high-temperature, alkaline conditions where alkali and alkaline-earth silicates interact. It could also be produced synthetically by mixtures of silica with sodium and calcium sources in the presence of water, followed by controlled cooling and crystallization.

See also

Silicate minerals, alkali silicates, calcium silicates, hydrated silicates.