Abstract
Two natural muscovite crystals from Governador Valadares, Brasil, have been studied by means of the Lang's X-ray topography method. Dislocation bundles lying in (001) planes as well as growth bands have been observed, which are directly correlated to the growth of {110}, {010} and { 3 1 l} sectors of the crystals. Growth dislocation Burgers vectors 1 2 [110] and 1 2 [ 110] as well as fault vectors connected with growth bands have been determined using extinction rules. In the light of defect configurations in these crystals, the “growth history” of the mica specimens has been analysed.
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