15 specimens of the more important ores are included. Approximately 1 1/2".
Included are specimens of Bauxite, Chalcopyrite, Malachite, Pyrite, Hematite, Magnetite, Limonite, Pyrrhotite, Siderite, Galena, Dolomite, Pyrolusite, Cassiterite, Sphalerite and Beryl.