VIIM5 VIM1 VIM2 VIM3 IV?-VIM5 [IVT5O15]
The following element site assignments are not derived from X-ray structural data, but are instead predicted from nominal cation size considerations. Smaller cations such as Fe2+, Mg2+, Fe3+, Mn3+ and Zn2+ have been preferentially assigned to M5 (highlighted in red). Larger cations such as Ca2+ and Na+ have been preferentially assigned to M4 (highlighted in green). Mn2+ has been preferentially assigned to M1, M2 and M3, as well as making up any deficiencies in M4 and M5.
| sample number | composition | P-T space |
|---|---|---|
| FKM-30 | (Mn2+0.73Ca0.29Na0.01)Mn2+1.00Mn2+1.00Mn2+1.00(Mn2+0.90Mn3+0.10)[Si4.95O15] | |
| FKM-45 | (Ca0.89Mn2+0.11)Mn2+1.00Mn2+1.00Mn2+1.00(Zn0.37Mg0.26Mn2+0.25Mn3+0.08Fe3+0.03)[Si4.87Fe3+0.12O15] | |
| FKM-45 | (Ca0.89Mn2+0.11)Mn2+1.00Mn2+1.00Mn2+1.00(Zn0.46Mg0.23Mn2+0.19Mn3+0.06Fe3+0.05)[Si4.87Fe3+0.12O15] | |
| FKM-54 | Ca0.99Mn2+1.00Mn2+1.00Mn2+1.00(Zn0.61Mg0.21Mn2+0.07Mn3+0.06Fe3+0.05)[Si4.90Fe3+0.10O15] | |
| FKM-195 | ||
| FKM-230 | (Ca0.80Mn2+0.20)Mn2+1.00Mn2+1.00Mn2+1.00(Mg0.45Mn2+0.29Fe2+0.26)[Si5.00O15] | |
| FKM-234 | (Mn2+0.63Ca0.40)Mn2+1.00Mn2+1.00Mn2+1.00(Mn2+0.84Mg0.09Mn3+0.07)[Si4.96O15] | |
| FKM-234 | (Ca0.54Mn2+0.47)Mn2+1.00Mn2+1.00Mn2+1.00(Mn2+0.84Mg0.13Mn3+0.03)[Si4.98Fe3+0.01O15] | |
| FKM-236 | (Ca0.73Mn2+0.29)Mn2+1.00Mn2+1.00Mn2+1.00(Mn2+0.69Mg0.26Mn3+0.05)[Si4.97O15] | |