These are the minerals used in the Mohs hardness scale: Mohs' Hardness Scale 1 2 3 4 5 6 7 8 9 10 Talc Gypsum Calcite Fluorite Apatite Feldspar Quartz Topaz Corundum Diamond To use the hardness scale, you try to scratch the surface of an unknown sample with a mineral or substance from the hardness scale (these are known samples).
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to scratch the surface of an unknown sample with a mineral or substance from the hardness scale
the minerals used in the Mohs hardness scale
the surface of an unknown sample with a mineral or substance from the hardness scale