This is a large, super-transparent blade of cerussite from the great Tsumeb locality, where the best cerussites are from. This is just a huge crystal. It has an interesting epitaxial plateau on one side, and a fin that sticks out from the main part of the crystal on the other side (this fin has some edge-wear). The crystal is unterminated on one of the ends and one of the long sides, from removal from the pocket. But it is terminated on "top" and along one of its sides. It has GLASSY luster that you cannot see in the photo, and a slightly smoky color. Ex. Willy Israel collection.