Description
Gonnardite, a rare mineral from the type locality of La Chaux de Bergonne in Gignat, Puy-de-Dôme department, Auvergne.
Gonnardite is a mineral of the zeolite family. Visible here as large white crystals in vacuoles in a basaltic rock.
A remarkably well-furnished specimen of good size, with very large crystals.
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