Crust

Incrusted bronze
MFA# 87.446

Description

Brown crust on glass
MFA# 84.19

A hard covering or coat on the surface of another material. In minerals or metals, a crust or deterioration product of one, may be redeposited over another. Weathering may oxidize or deteriorate the surface of some materials forming a hard, sometimes protective, crust. A surface crust may also be formed by pollution or by low solubility salts, such as calcium sulfate, that form glassy, adherent films. See Black crust, Gypsum crust, Gypcrete, and Caliche.

Synonyms and Related Terms

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

Additional Images

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  Black crust, Photo credit: V. Vergès-Belmin

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  Black crust, Photo credit: B. Fitzner

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  Salt crust, Photo credit: B. Fitzner

Resources and Citations

• ICOMOS-ISCS: Illustrated glossary on stone deterioration patterns

• Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996

• Encyclopedia Britannica, http://www.britannica.com Comment: "crust" [Accessed 18 Oct. 2005].

• Wikipedia: http://en.wikipedia.org/wiki/Crust (accessed Jan 6, 2006)

• Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000