Compositional characteristics of kinoshitalite from the Sausar Group, India

Ba‐rich and Ba‐poor micas with varying Mn and Mg content in octahedral sites coexist in isolated pockets in braunitea‐bixbyitea‐hausmannite ores that have been invaded by late silicic pegmatite and carbonate veins in the Sausar Group, India. The micas are secondary in nature and are pseudomorphs after carbonates and alkali feldspars. One of the micas approaches closelys ynthetic enda‐member kinoshitalite, BaMg₃Al₂Si₂O₁₀(OH)₂. The present study shows a complete solid solution between the K (phlogopite) and Ba (kinoshitalite) enda‐members. Compositional diversitiesin these micas are attributable to the different minerals that the micas replaced.