White, grey, brown or pale green mineral found in metamorphic rocks (4)

I believe the answer is:

talc

(Other definitions for talc that I've seen before include "White powder for the bathroom" , "It is used to absorb moisture" , "Soft white powder" , "Scented powder used after bathing" , "(Mineral providing) powder" .)

I've seen this clue in The Mirror.

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