Encrust (verb)

To cover or coat something thickly with a hard layer.

Origin:

Late 16th century: from french encruster or latin incrustare, from in- "into" + crustare "to form a crust".

Examples:

1. The rocks were encrusted with barnacles.
2. The ring was encrusted with precious stones.
3. The encrusted surface of the old mirror had to be cleaned.
4. Encrust means to cover something with a hard layer.
5. The encrusted layer of mineral can protect the underlying rock from erosion.