Ca2Al3Si3O10OH2

Ca2Al3Si3O10(OH)2 is a chemical formula representing a calcium aluminium silicate hydrate. It is not widely catalogued as a standalone mineral, but is used in discussions of calcium‑bearing aluminosilicate phases and as a possible composition for synthetic or laboratory-formed hydrates within the broader aluminosilicate family.

Classification and composition

The formula indicates a framework built from tetrahedrally coordinated silicon and aluminum, with calcium cations and hydroxide groups contributing to charge balance and hydration. The Si:Al ratio is 1:1, a common motif in aluminosilicate chemistry, while the two hydroxide groups point to a hydrated or "intermediate" state that can affect stability and water handling within the crystal structure.

Structure and chemistry

If such a phase exists in nature or can be synthesized, it would be expected to resemble other aluminosilicate frameworks in which SiO4 and AlO4 tetrahedra share corners to form a three-dimensional network. The presence of OH groups suggests potential hydrogen bonding and possible dehydroxylation behavior upon heating, which can influence structural stability and phase transitions in experimental or geological settings. Exact crystallographic data for this specific composition are not universally catalogued.

Occurrence and synthesis

There is no widely recognized mineral with this exact formula in major mineral databases. It may arise as a synthetic phase produced under hydrothermal or high‑pressure conditions, or as a hydration product in Ca‑Al‑Si rich systems. In research contexts, it serves as a reference composition for exploring hydration and charge‑balancing in aluminosilicate frameworks.

See also

Aluminosilicate minerals, feldspars, zeolites, hydrous silicates.