incrustation

Short definition from Wiktionary

Noun

1. 1
   The act of incrusting, or the state of being incrusted.
2. 2
   A crust or hard coating of anything upon or within a body, as a deposit of lime, sediment, etc., from water on the inner surface of a steam boiler.
3. 3
   A covering or inlaying of marble, mosaic, etc., attached to the masonry by cramp irons or cement.
4. 4
   Anything inlaid or embedded.
5. 5
   An accumulated characteristic of a person that disguises their true nature.