Mineral replaced by cornstarch in most cosmetic powders (4)

I believe the answer is:

talc

(Other definitions for talc that I've seen before include "Powder used as toiletry" , "Mica - scented body powder" , "(Mineral providing) powder" , "Soft mineral; powder" , "Scented powder used after bathing" .)

I've seen this clue in the LA Times.

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