Low end of the Mohs scale (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
talc
(Other definitions for talc that I've seen before include "Softest mineral on Mohs hardness scale" , "Fragrant powder" , "In brief, popular body powder" , "Powdered mineral" , "Toilet powder - mica" .)