Minerals are pure, rocks can be formed from one or more minerals. A piece of talc is a rock formed of a single mineral.
Clays, are rocks and can be very soft.
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Talc is the softest mineral; his hardness is 1 on the Mohs scale.
Talc is one of the softest minerals with a hardness of 1. Talc is also crushed into a powder called talcum powder which is used a fertilizer.
Igneous rock is formed.