residual clay
Definition
Noun 1. Residual clay: A type of clay that remains in place after the rock from which it formed has weathered and its soluble components have been dissolved and carried away by water. It is the insoluble residue left behind.
Usage
The term "residual clay" is used in geology, soil science, and ceramics to describe clay that has formed and remains at its site of origin, as opposed to clay that has been transported by water, wind, or ice.
Examples
- The red color of the soil in that region is due to the presence of residual clay rich in iron oxides.
- Residual clay deposits are often less pure than sedimentary clays because they contain weathered fragments of the parent rock.
- For their pottery, the artisans prefer using local residual clay sourced from the weathered granite hills.
Advanced Usage
- In situ formation: "Residual clay" is often discussed in contrast to "transported clay" or "sedimentary clay." Its key characteristic is that it is formed (in its original place).
- Composition: The specific mineral composition of a residual clay (e.g., kaolinite, illite) depends heavily on the composition of the parent rock and the climate under which it weathered.
Variants and Related Words
- Residual soil (n): The general layer of soil, including clay, silt, and sand, that remains atop bedrock after weathering. Residual clay is a component of residual soil.
- Kaolin (n): A common and commercially important white residual clay, resulting from the weathering of feldspar in granite.
- Laterite (n): A type of residual soil rich in iron and aluminum oxides, often forming in hot, wet tropical climates.
Synonyms
- Primary clay
- Residuary clay
Antonyms
- Sedimentary clay
- Transported clay
- Secondary clay
Noun
-
the soil that is remaining after the soluble elements have been dissolved
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