The Minerals Science Activity Kit is the complete solution for young Geologists. This activity kit contains 20 types of minerals specimens that students can investigate the Mohs hardness scale, Streak test, Magnetism and acid resistance test. (Acid not included) The minerals specimens include : Talc, Gypsum, Calcite, Fluorite, Apatite, Orthoclase, Quartz, Topaz, Corundum, Magnet. Accessory tools: knife, iron nail, magnet, streak plate, glass plate, copper plate, iron plate, garnet board, hand lens, acid drop bottle (empty), instruction manual. Average sizes are 2 cm X 3 cm X 1.5 cm