You searched for: “pomace
pomace, pumice
pomace (PUHM is, POHM is) (noun)
1. That which has been crushed into a pulp: The tomato pomace which the farmers made is great in tomato sauce.
2. The residue of material from which the liquid has been removed: There was a layer of pomace at the bottom of the grape press.
pumice (PUHM is) (noun)
A stone that is filled with air spaces and is very light, often used as a polishing agent: There was some pumice on exhibition that was from Mt. Vesuvius in Southern Italy.

The lapidists used a fine pumice to clean, smooth, and furbish the gem once it had been cut.

The blades of the equipment used to create the thick tomato pomace need sharpening; so, she will use a fine pumice to do the job.