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Beinn Alligin, Scotland Beinn Eighe is unusual amongst the Torridon mountains in that its summit is not composed of Precambrian Torridonian Sandstone, but Cambrian basal quartzite, a very hard but brittle rock. This gives it its familiar light coloured summits, a notable contrast to the other peaks in the area. Underlying the quartzite is a bed of Torridonian Sandstone.