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Sources of Deep Ocean-Basin Sediments, continued Chemical Deposits When substances that are dissolved in ocean water crystallize, these materials settle to the ocean floor as potato-shaped lumps of minerals called nodules. nodule a lump of minerals that is made of oxides of manganese, iron, copper, or nickel and that is found in scattered groups on the ocean floor Other minerals, such as phosphates, are also carried in the ocean floor before they crystallize and form mineral deposits on the ...
Some chemical rocks, such as those deposited when seawater evaporates, have a nonclastic texture in which the minerals form a pattern of interlocking crystals. However, in reality, many of the sedimentary rocks classified into the chemical group also contain at least small quantities of detrital sediment. Common chemical rocks include limestone, rock gypsum, and coal (e.g., lignite and bituminous). â¢ Sedimentary environments are those places where sediment accumulates.