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An underground gem discovered by Norbert CASTERET. This is a protected and classified, particularly rich in concretions including Aragonite, a true rock crystal. Access and visits are made on a horizontal plane., Tour sound and light in large halls and galleries decorated with draperies. The walls are covered with aragonite, gypsum or calcite, a garden underground component. This site is unique eco-development which has been the subject and the work of study and protection of the concretions.