NaCaAlSiO4HO

NaCaAlSiO4HO is a generalized empirical formula used to describe a sodium-calcium aluminosilicate containing hydroxide groups. In this representation, aluminum and silicon occupy tetrahedral sites in a framework of AlO4 and SiO4, and charge-balancing cations include Na+ and Ca2+. The HO suffix denotes hydroxide groups or structural water associated with the material, rather than a discrete molecule.

As an empirical composition, the exact stoichiometry and cation distribution vary with formation conditions. The simplified formula implies a 1:1 ratio of aluminum to silicon in the framework, producing a negatively charged aluminosilicate lattice balanced by interstitial Na+ and Ca2+. In practice, substitutions and hydration can modify the Al:Si ratio and the amount of incorporated water, yielding related compositions.

The material could adopt a range of aluminosilicate framework types, including zeolite-like or feldspathoid-like structures, depending on synthesis or natural formation. Interstitial Na and Ca cations provide potential ion-exchange sites, and the presence of hydroxide groups indicates possible hydration and protonation behavior.

Occurrence and applications: NaCaAlSiO4HO may be encountered as a synthetic aluminosilicate used in catalysis, ion exchange, or materials science research, and could also appear as part of a solid-solution series in natural or synthetic systems. The exact properties depend on crystallinity, hydration state, and framework topology.

See also: aluminosilicate, zeolite, feldspar, hydroxyaluminosilicate.