Japanese mineral specimens are RARE not only on the European or American market. Arsenic crystals are RARE. And when you combine the two you hit the jackpot. Go look at this specimen. Anthracite gray clusters of Arsenic from the Akadani Mine in Fukui Prefecture on Honshu Island. Akadani was originally an Antimony mine, but much more famous to collectors for its classic balls of rhombohedral arsenic crystals. Mindat claims that the mine produced “perhaps the world´s best crystallized native arsenic”.