Kaersutite
Boutaresse, Saint-Alyre-ès-Montagne, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Size 18 mm - Specimen broken according to an alignment of indistinct holes or channels resulting from partial melting during a destabilization phase. On the right, the fracture shows the internal molding of a channel by a silicate crust. This inner mold looks like a cerith type shell, oddly enough. – Collected by Eric Naud - Collection and photo ...
© François Périnet