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Image originally shown at http://www.slic2.wsu.edu:82/hurlbert/micro101/images/101nodules21.gif
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Possible definitions for nodules
nodule
In geology, a rounded mineral concretion that is distinct from, and may be separated from, the formation in which it occurs. Nodules usually are elongated and have a knobby irregular surface; they are generally oriented parallel to the bedding. Chert and flint, clay ironstone, and phosphorites commonly occur as nodules. Manganese-rich nodules are found on the ocean floor.
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