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Chlormayenite Ca 12 Al 14 O 32 [♦ 4 Cl 2 ] (♦-vacancy) is partially hydrated micro porouss mineral with hydroxide groups situated at various crystallographic sites. There are few mechanisms describing its hydration. The first one assumes Cl −  substitution by OH −  at the center of the structural cages ( W- site). The second one determines the converting a  T 1O 4  tetrahedron to a  T 1O 3 (OH) 3  octahedron due to the replacement of oxygen at the  O 2 site by three OH-groups according to the scheme: ( O2 O 2−  +   W  Cl − ) → 3 ×   O 2a OH. The third mechanism, not considered so far in the case of zeolite-like minerals, includes the hydroxide incorporation in form of hydrogarnet defect due to the arrangement of tetrahedral (OH) 4  in vacant cages. This yields a strong hydrated phase containing even up to 35% of water more than in any currently known mineral applicable to Portland cement. Moreover, water molecules present in different structural cages are stable up to 355 K while dehydroxylation linked to the gradual loss of only 8% of OH −  groups according to 3  O 2a OH −  →  O2 O 2−  +  W  OH −  +  g H 2 O occurs at temperature range from 355 K to 598 K.

Different route of hydroxide incorporation and thermal stability of new type of water clathrate: X-ray single crystal and Raman investigation