CsAlSi2O6

CsAlSi2O6 is a synthetic silicate mineral. Its chemical formula indicates it is a compound containing cesium (Cs), aluminum (Al), silicon (Si), and oxygen (O) in a specific ratio. This particular composition is often referred to as pollucite, though natural pollucite has a more variable composition. The synthetic form, CsAlSi2O6, represents a pure end-member of the pollucite series.

The structure of CsAlSi2O6 is based on a framework of corner-sharing [SiO4] and [AlO4] tetrahedra. These tetrahedra form a three-dimensional network with large cavities. The cesium ions (Cs+) occupy these cavities, balancing the negative charge of the aluminosilicate framework. This crystal structure is characteristic of the zeolite group, although CsAlSi2O6 is often classified as a feldspathoid due to its framework structure and composition.

CsAlSi2O6 is typically synthesized in laboratories for research purposes. It is of interest for its potential applications in several fields. Due to its ability to incorporate large cations like cesium, it has been investigated as a host material for the immobilization of radioactive cesium isotopes, such as Cs-137, which is a byproduct of nuclear fission. Its stability under various conditions makes it a promising candidate for radioactive waste disposal. Furthermore, its structural properties are studied in the context of understanding the behavior of silicate glasses and crystalline phases under extreme conditions.