Medina Rocks and Minerals - Moh's scale of Mineral Hardness

The softest mineral on Moh's scale is Talc

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The hardest mineral on Mohs' scale is diamond.

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Of the minerals listed on Mohs' scale, gypsum can scratch only talc

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Quartz and calcite can look similar. In a field test, a copper penny could be used to scratch calcite. However, the same penny could not scratch quartz

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Fluorite cannot scratch apatite, but it can scratch talc, gypsum, and calcite.

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Apatite can scratch fluorite, calcite, talc, and gypsum.

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Feldspar can only scratch glass

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Quartz is slightly harder than feldspar. Both minerals can scratch glass, but only quartz can scratch steel

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Topaz can scratch all minerals on Mohs' scale, except for corundum and diamond

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Corundum can scratch all of the minerals on Mohs' scale, except diamond

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