NaAlSi3O82H2O

NaAlSi3O8·2H2O is a chemical formula that denotes a hydrated form of a sodium aluminum silicate related to the feldspar family. While NaAlSi3O8 by itself corresponds to albite, the addition of two water molecules suggests lattice or interstitial water within the structure. In principle, the framework would comprise silicon and aluminum tetrahedra linked through shared oxygen atoms, with sodium ions balancing the framework charge and water molecules occupying available voids in the crystal lattice.

The existence of a discrete, well-characterized mineral with the exact formula NaAlSi3O8·2H2O is not established in standard mineral catalogs. Hydration in aluminosilicate systems more commonly leads to a variety of other phases, such as clays or zeolite-like materials, rather than a stable, defined NaAlSi3O8·2H2O compound. If such a hydrated form were to occur, it would likely be metastable and prone to dehydrate upon heating or pressure changes, potentially reverting toward the anhydrous albite or transforming into other hydrated silicates.

Occurrence and significance are thus largely theoretical or situational: a representation of how hydration can interact with a feldspar-like framework, rather than a widely recognized mineral species. In practical terms, albite and related feldspars are used as reference minerals for understanding silicate structures, hydration effects, and diagenetic alteration in rocks. The formula serves as a conceptual example of how water can be incorporated into aluminosilicate frameworks, rather than as a standard, independent mineral.