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Geophysically hardened clay. Normally classified by geologists as a sedimentary rock composed primarily of clay-sized particles and which is not laminated or easily split into thin layers. Such rocks that show cleavage roughly parallel to the bedding plane often are classed as clay shales. Massive and blocky claystones are sometimes called mudstones, but some geologists class as mudstones only the partly hardened muds that slake when wetted, reserving the term 'claystone' for fully hardened matter.
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Clay Other
Clays that are not kaolins, ball clays or bentonites. For example, stoneware clays are mixtures of all of the above plus quartz, feldspar, mica and other minerals. There are also many clays that have high plasticity like bentonite but are much different mineralogically. |
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