Which is the softest mineral on the Mohs hardness scale?

Gypsum
Calcite
Fluorite
Talc
Talc  The Mohs scale is a scale of mineral hardness. It was created by Friedrich Mohs in 1812. The scale is based on the ability of one mineral to scratch another. The hardest mineral on the Mohs scale is diamond, which can scratch any other mineral. The softest mineral on the Mohs scale is talc, which can be scratched by a fingernail.

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