Rubbing of wood on a rough surface

I want to know the word or phrase for rubbing a piece of wood on a stone or a rough surface to get a paste. Example Sandalwood emits fragrance only when it is ------(fill) on a stone. Or shall we say Sandalwood emits fragrance only when it wears out?

Solution 1:

The only word I can think of is ground - this is the word that you would use when turning corn into flour, (grinding or milling) which is a very similar activity.

Solution 2:

The word I would use is abrade, so

'Sandalwood emits fragrance only when it is abraded on a stone'

Definition from Merriam-Webster:

to rub or wear away especially by friction