|Classroom Collection of Rocks and Minerals Designed for general classroom use. Includes 50 specimens in the following groups: Igneous, Sedimentary and Metamorphic Rocks, Ores, Gemstones and Minerals in the Scale of Hardness. Includes a Rock and Mineral Study Guide. Includes 50 specimens of 1" X 1" in size, numbered and references the enclosed identification key. Includes storage box with compartmented tray to hold the specimens.