Clay is a textural term referring to particulate material under 4 µm in size (Wentworth, 1922). A proportion of this material will be clay minerals, an important group of silicate layer-lattice minerals which occur as minute platey, or more rarely, fibrous crystals. Their very fine grain size precludes any determinative work using smear slides.
KeywordsClay Mineral Abyssal Plain Textural Term Smear Slide Main Distinguishing Feature
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