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Micas with variable Ba content in the interlayer sites occur in silicate-rich bands within the high-grade, metamorphic banded iron formation enclosing massive sulfide bodies in the Broken Hill deposit, Namaqualand Metamorphic Complex, South Africa. In those layers that contain neither potassium feldspar nor muscovite, a green, barian (up to 17 wt% BaO), trioctahedral mica occurs that is similar to kinoshitalite. In contrast to the originally described kinoshitalite, however, this mica is Fe-rich (average X Fe  = 0.65), suggesting the existence of an Fe analogue of kinoshitalite not described to date. Ion chromatographic analysis indicates that about 8% of the total Fe in this mica is present as Fe 3+ , and a typical formula is (Ba 1.2 K 0.4 )(Fe 2+  3.2 Mn 0.2 Mg 2.0 Al 0.2 Fe 3+  0.1 Ti 0.2 )(Al 3.0 Si 5.0 )O 20 (OH 1.8 F 2.2 ). The unit-cell parameters were determined as follows: a = 5.383(2), b = 9.328(8), c = 10.055(8) Å, β = 100.44(5)°, with V = 496.5 Å 3 , and Z = 2. The space group is C2/m. The Ba-rich mica formed at the peak of metamorphism (T = 670 ± 20°C, P = 4.5 ± 1.0 kbar) at a pH below the muscovite + potassium feldspar buffer, f O₂  buffered by quartz + fayalite + magnetite and f s₂  between 10 -5  and 10 -7 .

An Fe analogue of kinoshitalite from the Broken Hill massive sulfide deposit in the Namaqualand Metamorphic Complex, South Africa