Heavy metal minerals. Historical artwork of some of the minerals of zinc and tin, as found in 19th- century mines. The minerals and where they were mined from are: smithsonite (containing zinc, upper left [Cumberland, England] and upper right [Stolberg, Germany]), tin-stone (tin oxide, SnO2, centre [Morbihan, France]), calamine (containing zinc, lower left [Vieille Montagne, Belgium]), and blende (zinc sulphide, ZnS, lower right [Kapnik, Hungary]). Smithsonite and calamine are names that have been used for both zinc carbonates and zinc silicates. Artwork from Mines and Miners (L. Simonin, 1868).