DescriptionI guess its been cleaved into its excellent shape.Iceland spar is a type of calcite crystal that polarizes light that passes through it and doubles a transmitted image.For a few years I had suppliers in Pakistan. There are some impressive crystals they find there.There are many spots in the world that have been renowned for millennia for their interesting mineral specimens. The main categories are crystals, fossils, and meteorites.Over the decades I’ve been selling collectibles my market has been about 97% coins, 2% paper money, 1% everything else.