In ancient times(3 - 5.000 years ago) the lead/silver ore was melted in furnaces. Some of the furnaces where located along the coast and the residue of the ore was thrown into the sea. These slags containing minimal amounts of lead, silver, copper and other minerals. Here effects of the sea salt and created a variety of new mineralizations in the slag cavities.
I dive there in the sea to collect them and open the slags to find the micro cristals. I made some photo's with a digital Nikon 995 camera and my Nikon SMZ 1000 microscope. Now I photograph the minerals with a "Macrorail Vertical Pro" and stack the images with the Helicon program.