Abstract
The twinning laws and the composition of one hundred and ten plagioclase twin crystals from the anorthositic rocks of Oddanchatram, Madurai District, have been determined with the four-axes universal stage by the Reinhard’s method. The significance of the frequencies of different twinning laws in the plagioclases as well as the mineralogical and textural characteristics of the rocks in relation to their genesis are briefly discussed.
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