The hardness scale collection consists of minerals arranged according to the Mohs hardness scale. The individual samples are neatly stored in a glass box with a lid and serve to demonstrate the differences in hardness of minerals from talc to diamond. The exhibits are approximately 2–4 cm in size and are glued into the box. It contains 10 types of minerals with Czech descriptions.
1) BOX Talc, rock salt, calcite, fluorite, apatite, feldspar, quartz, topaz, corundum, diamond (model).
