Pressure-induced hydration of the clay mineral nacrite, Al2Si2O5(OH)4 is, in contrast to its polymorph kaolinite, partially irreversible. At ambient conditions after pressure release, a majority phase with composition Al2Si2O5(OH)42H2O with an intense (002) diffraction peak near d ∼8.4 Å has been found. Both in situ X-ray diffraction and simulations based on the density functional theory point to intercalation of molecules in nominally nonswelling clays and specific geophysical and geochemical conditions.
All Science Journal Classification (ASJC) codes
- Geochemistry and Petrology
- Atmospheric Science
- Space and Planetary Science