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Sonora Sunset Agate is a rare variety of agate, found in Sonora, that was purchased in the early 1980ies in Europe.The hostrock is from sedimentary origin. The agates are occuring in dark nodules up to a size of 20 cm in diameter. The opened nodule is presenting first a dark coloured rim containing small agate-systems of different colours. Then follows a intensively coloured banded agate (red and blue are the most desiderated colours). Very often there is a druzy center in the middle of the Sonora Sunset Agate-Nodules.