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The identification of the layer sequences of the polytypes listed above is reported. The birefringence of these structures is also given. Two of the identified structures [14L (7 7) and 24L (7 5 5 7)] have unitcell dimensions identical with those of structures previously reported [14L (5 4 2 3) and 24 L(5 3)3 respectively] but the layer sequences are different.
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Mardix et al. (1967) studied this question.
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