Chillipepperstone 12 Natural Rock School Science Geology Globe Sample Collection, Untumbled, Raw Natural collection of 12 common mineral samples for geological studies and rock collectors Natural, unplished, cust to small chunks Great for kids (Age 3+), gifts, stone collectors, geology studies, desktop decoration Size between 1/3 to 1/2 inches Including: Quartz Feldspar Sericite Talc Chalcopyrite Fluorite Hematite Malachite Realgar Pyrite Orpiment Iceland Spar