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MFA Acc. #: 87.446


A hard covering or coat on the surface of another material. In minerals, a crust on one mineral may be redeposited over another. Weathering may oxidize or deteriorate the surface of some materials forming a hard, sometimes protective, crust. A crust may also be formed by pollution. See black crust, gypsum crust, gypcrete, and caliche.

MFA Acc. #: 84.19

Synonyms and Related Terms

crusting; incrustation; encrustation; black crust; gypsum crust; caliche; gypcrete

Additional Images

Sources Checked for Data in Record

  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
  • Encyclopedia Britannica, Comment: "crust" Encyclopædia Britannica Premium Service. [Accessed 18 Oct. 2005].