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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 ...
Coal comes in different types, depending on the extent of compaction and alteration. Obviously, we define the term 'sediment' pretty broadly to classify coal! At the other end are a group of rocks called evaporites. They're rocks made of sediment produced by purely chemical reactions as water evaporates. Inland lakes or seas, like the Dead Sea, are environments where that can happen. The two common evaporite rocks are gypsum and salt. In the middle of this category are rocks made from sediment originally produced by either plants or animals living in water.