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Iron chlorite with compositions intermediate between the two end-members daphnite [Fe 5 Al 2 Si 3 O 10 (OH) 8 ] and Fe-amesite [Fe 4 Al 4 Si 2 O 10 (OH) 8 ] were synthesized from gels, under f O₂  conditions defined by the solid oxygen buffer Fe-FeO. The unit-cell parameters and volume of chlorite with Si-content ranging from 2.3 to 2.7 were calculated. A least-squares fit of these data yields V 0  Fe-ames  = 213.06 cm 3  and V 0  daph  = 216.50 cm 3 . The molar volume of daphnite is similar to that estimated by Vidal et al. (2001), but the volume difference between Fe-amesite and daphnite is too low. The experimental data were also fitted for reasonable values of V 0  Daph  - V 0  Fe-ames  and V FeMg-1 , with linear (ideal) or non-ideal volume models involving a positive excess volume. With these models we obtain V 0  Daph  between 216 cm 3  and 217.49 cm 3 , and V 0  Fe-ames  between 209 and 211.35 cm 3 .

Experimental data on the Tschermak substitution in Fe-chlorite