MOHS SCALE / Mineral Examples / Ordinary Examples 1: Talc 2: Gypsum / 2.5 Fingernail 3: Calcite / 3.5 Copper penny 4: Fluorite 5: Apatite / 5.25 Glass / 5.5 Knife 6: Orthoclase 7: Quartz / 7.5 Steel file 8: Topaz 9: Corundum 10: Diamond EXPERIMENTS ACTIVITY