Difference between revisions of "Marl"
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== Description == | == Description == | ||
| − | A friable mixture of [http://cameo.mfa.org/materials/fullrecord.asp?name=clay clay] that contains a high proportion of [http://cameo.mfa.org/materials/fullrecord.asp?name=calcium | + | A friable mixture of [http://cameo.mfa.org/materials/fullrecord.asp?name=clay clay] that contains a high proportion of [http://cameo.mfa.org/materials/fullrecord.asp?name=calcium%20carbonate calcium carbonate]. Marls are secondary clays that often contain [http://cameo.mfa.org/materials/fullrecord.asp?name=sand sand], [http://cameo.mfa.org/materials/fullrecord.asp?name=ferric%20oxide iron oxide], and other impurities. Marls are most often used as alkaline additives to soil. As a pottery clay, marl tends to be [http://cameo.mfa.org/materials/fullrecord.asp?name=aplastic%20clay aplastic] and is often used for [http://cameo.mfa.org/materials/fullrecord.asp?name=slip%20glaze slipware], [http://cameo.mfa.org/materials/fullrecord.asp?name=earthenware earthenware], and [http://cameo.mfa.org/materials/fullrecord.asp?name=brick brick]. Some examples of marls used in pottery are (Fournier 1996): |
| − | - Keuper marl: contains [http://cameo.mfa.org/materials/fullrecord.asp?name=magnesium | + | - Keuper marl: contains [http://cameo.mfa.org/materials/fullrecord.asp?name=magnesium%20carbonate magnesium carbonate] and [http://cameo.mfa.org/materials/fullrecord.asp?name=gypsum gypsum]; variable in color |
- Etruria marl: contains almost no [http://cameo.mfa.org/materials/fullrecord.asp?name=lime lime] | - Etruria marl: contains almost no [http://cameo.mfa.org/materials/fullrecord.asp?name=lime lime] | ||
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== Authority == | == Authority == | ||
| − | * | + | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 118 |
| − | * | + | * Henry Hodges, ''Artifacts: An Introduction to Early Materials and Technology'', Ronald P. Frye, Kingston, Canada, 1988 |
| − | * | + | * Robert Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Company, Radnor, PA, 1992 |
| − | * | + | * Random House, ''Webster's Encyclopedic Unabridged Dictionary of the English Language'', Grammercy Book, New York, 1997 |
* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | * ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | ||
Revision as of 07:37, 24 July 2013
Description
A friable mixture of clay that contains a high proportion of calcium carbonate. Marls are secondary clays that often contain sand, iron oxide, and other impurities. Marls are most often used as alkaline additives to soil. As a pottery clay, marl tends to be aplastic and is often used for slipware, earthenware, and brick. Some examples of marls used in pottery are (Fournier 1996):
- Keuper marl: contains magnesium carbonate and gypsum; variable in color
- Etruria marl: contains almost no lime
- Cambridge marl: contains about 40% lime
Synonyms and Related Terms
Keuper marl; Etruria marl; Cambridge marl; calcareous clay; marga (Port.)
Additional Information
R. Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Co., Radnor, PA, 1996.
Authority
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 118
- Henry Hodges, Artifacts: An Introduction to Early Materials and Technology, Ronald P. Frye, Kingston, Canada, 1988
- Robert Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Company, Radnor, PA, 1992
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000