Difference between revisions of "Marl"
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| − | [[File:1996.98-E12668CR-d1.jpg|thumb|]] | + | [[File:1996.98-E12668CR-d1.jpg|thumb|Marl clay figurine<br>MFA3 1996.98]] |
== Description == | == Description == | ||
| + | [[File:Diatomaceous_marl.jpg|thumb|Diatomaceous marl]] | ||
| + | A friable mixture of [[clay|clay]] that contains a high proportion of [[calcium%20carbonate|calcium carbonate]]. Marls are secondary clays that often contain [[sand|sand]], [[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 [[aplastic%20clay|aplastic]] and is often used for [[slip%20glaze|slipware]], [[earthenware|earthenware]], and [[brick|brick]]. Some examples of marls used in pottery are (Fournier 1996): | ||
| − | + | * Keuper marl: contains [[magnesium%20carbonate|magnesium carbonate]] and [[gypsum|gypsum]]; variable in color | |
| − | + | * Etruria marl: contains almost no [[lime|lime]] | |
| − | + | * Cambridge marl: contains about 40% lime | |
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== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Keuper marl; Etruria marl; Cambridge marl; calcareous clay; marga (Port.) | Keuper marl; Etruria marl; Cambridge marl; calcareous clay; marga (Port.) | ||
| − | == | + | ==Resources and Citations== |
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* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 118 | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 118 | ||
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* ''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 | ||
| − | * Art and Architecture Thesaurus Online, | + | * Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000 |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 12:15, 17 October 2022
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.)
Resources and Citations
- 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, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000