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Ágata.
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El ágata no es un mineral específico, sino un conjunto de variedades micro cristalinas del cuarzo (sílice). Se caracteriza por presentar una serie de bandas concéntricas de colores similares, opacos y translúcidos, que recuerdan el corte de un tronco de árbol en sentido circular. Puede adoptar diversas formas y presentarse en muchas variedades. Es una roca dura y resistente a los reactivos químicos.
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