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Six sets of samples from five low-temperature regional metamorphic regions were investigated m order to determine the evolution of white K-mica polytypes as a function of temperature The data show that disordered group A structures (Ad) associated with small amounts of mixtures of 1M and 2Mj structures occur m the diagenetic zone. The true lMd structure was found to be less common than suggested by previous authors. At anchizonal grades, Ad and lMd structures disappear and mixtures withdoi:10.5169/seals-58477 fatcat:f4q4s2gopjfzdjwgu5lry6xytm