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These specimens of banded flint were collected decades ago in the area of El Brull, in the Montseny massif, and identified as agate. They appear in nodules and veins, embedded in a siliceous limestone, presenting bands of gray tones, between light to dark gray. These kind of striped flind are well know in jewelery, and very appreciated. It is a unique curiosity of the Catalan mineralogy of many years ago.