Jarosite

Item Description

A great and attractive specimen of the potassium, iron sulfate, Jarosite featuring dozens if not hundreds of small, bright coppery-reddish colored, modified trigonal crystals on matrix. Despite the smaller size of the crystals, the quality is excellent, showing bright luster, razor sharp faces, and even some gemminess! Obviously, the crystals are best seen under higher magnification, and I've photographed them under the microscope to better illustrate their quality. If you collect minerals from Lavrion (Laurion), don't miss out on this one, as they are not seen on the market these days. The famous mines around this historic district have produced some of the most well known and distinctive minerals from any European locality. Mining took place around this area as far back as the Bronze Age as analysis of ancient isotopes of lead in the objects from that time indicate they were manufactured, in large part, with metal from the Laurion.