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A specimen of the ‘Gardnos breccia’ was explored, in which granitic gneiss clasts were found to dominate over a dark matrix. Some clasts retained their cataclastic structure. The matrix of the specimen showed various colours, such as gray, black, and beige, while exhibiting different levels of hardness. In addition, the matrix appeared as an almost isotropic and microcrystalline mass. Quartz, K-feldspar,...
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