Crossword Genius

Mineral with a hardness of 1 on the Mohs scale (4)

Ross

I believe the answer is:

talc

(Other definitions for talc that I've seen before include "Fragrant powder" , "soother" , "Powder used as toiletry" , "Soft white powder" , "Soft stuff" .)

I've seen this clue in The Sunday Times and The Times.
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