abrade

In all cases, however, a hard file will abrade the surface of the false stone.

This is specially the case with Chaffinches and Bramblings: Greenfinches abrade later.

Genuine amber, when rubbed together, emits a very fragrant odour similar to a fresh lemon, and does not abrade the surface.

Wherever they find calcareous strata to abrade, the water is almost milklike in hue for miles around.