encrustation

 
Pronunciation: /ˌɪnkrʌˈsteɪʃ(ə)n/
(also incrustation)

noun

[mass noun]
  • the action of encrusting or state of being encrusted.
  • [count noun] a crust or hard coating on the surface of something: the sides are white with encrustations of salt
  • [count noun] Architecture a facing of marble on a building.

Origin:

early 17th century (originally as incrustation): from late Latin incrustatio(n-), from the verb incrustare (see encrust)