Lavagna di Genoa, ardesia di Lavagna, from Genoa, Liguria, Italy
Geological description:
Black slate. Fine-grained with fine layering and a few vein stringers parallel to the cleavage.
Comments:
It is probably from the quarries near Castello di Lavagna. See Corsi's comments on Lavagna in his introduction to this class in his Catalogo Ragionato.