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There are chalcedony and amethyst formations in two fields in Aydıncık-Yozgat (West of Aydıncık District, Keşlik area and Southwestern of Hacıilyas). The gemstones in this region have been formed within the gaps and cracks of the brecciated rocks of the fault zone in altered andesites. Chalcedony and amethyst are either present in the form of crack fillings from a few millimeters to 10 cm in width,...
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