Mohs Hardness Scale - Rock and Mineral Collection and ID Chart - 9 Real Specimens Great earth science resource - Chart with samples on the Mohs Hardness Scale Includes numbers 1-9 (all except diamond) Specific samples included are Talc, Gypsum, Calcite, Fluorite, Apatite, Feldspar, Quartz, Topaz, Corundum Wonderful for Science Fair presentations on Rocks, Minerals or Geology The chart measures 8 1/2" x 5 1/4" with samples affixed to a sturdy card with ziplock protective plastic covering