Talk:AFm phases

Except in very rare circumstances and particular mineral deposits, AFm phases are not really natural minerals but mineral phases formed during cement hydration.

AFm phases have the structure of layered double hydroxides (LDH)
As AFm phases have the structure of layered double hydroxides (LDH), complementary information is available on the corresponding pages in different languages. The French version entitled fr:hydroxyde double lamellaire provides many useful references and also gives an indicating series for the selectivity coefficients for anion exchange.

According to Miyata (1983), the equilibrium constant (selectivity coefficient) for anion exchange varies in the order CO3(2-) > HPO4(2-) > SO4(2-) for divalent anions, and OH- > F- > Cl- > Br- > NO3- > I- for monovalent anions, but this order is not universal and varies with the nature of the LDH. Shinkolobwe (talk) 10:20, 18 April 2023 (UTC)