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Agates from the Rosana quarry  are usually only grey, white and dark-brown colored. The nodules are reaching sizes up to 10cm diameter. Beside fortress-like structure is also”Membrantrümmerachat-structure” inside the nodules The portion of carbonate-filled nodules is very high. However these carbonate fillings enrich the design of the agates under UV light, whereby the carbonates intensively red-orange and the agate shine partly greenish.