Encrustation

Pronunciation: /ˈɛnkɹəstˈætˈaɪˌɑn/

Encrustation (noun)

  1. A hard layer that forms on a surface over time, often from minerals or other substances.
  2. A thick deposit that builds up on an object, making it rough or covered.

Examples

  • The pipe developed a hard surface layer over time.
  • Salt formed a hard surface layer on the metal.