Rare now, a pairing of pyramidal crystals of golden pyrite with dark magnetite, both in massive form and crystals up to over one centimeter. The mines at this locality go all the way back to the Roman era. Starting in the 1800s, the exploited mineral became the pyrite, used to get the "vetriolo di ferro," very important for the textile industry and then (from 1858) for the sulfuric acid. This specimen is almost solid magnetite and pyrite. Ex. Mullane Collection.