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{{subst:Please link images|File:Outcrops of pyrometamorphic rocks (porcelanites) from 17th century's coal seam fires at Mont Salson, Saint-Etienne, France.jpg}} ~~~~
Captions
Outcrops of pyrometamorphic rocks (porcelanites) from 17th century's coal seam fires at Mont Salson, Saint-Etienne, France
Roches pyrométamorphiques (porcelanites) issues de feux de mines souterrains datés du 17ème siècle au Mont Salson, Saint-Etienne, France