Pieces of eight minerals - Cordua, William S. (William Sinclair), 1947- (St. Croix Rockhounds, Stillwater, MN, 2003)
2 p.
Keywords: Groundwater pollution; Supergene deposit; Geology; Mineralogy; Corrosion; Minerals; Silver sulphide; Acanthite; Spanish pieces of eight; Ore deposits; Coins--Analysis; Covellite; Copper sulphide