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The reaction between hydrogrossular and hydrogen chloride (HCl) gas was performed in a fixed bed reactor above 400 °C. The hydrogrossular was efficiently reacted with HCl gas in the temperature range of 400 to 950 °C and transformed into Ca 12 Al 9.9 Si 4.05 O 32 Cl 5.9 (calcium aluminum chlorosilicate). The crystal structure of the product phase Ca 12 Al 9.9 Si 4.05 O 32 Cl 5.9 was cubic, space group I43d, with unit cell a ) 12.0173(1) Å, and was similar to that of wadalite. The structure consists of a framework of (Al,Si)O 4 tetrahedra. A large cavity in the framework accommodates Ca-Cl-Ca linearly coordinated atoms.

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