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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 ...
d. -Larger particles form conglomerates; coarsest texture of clastic rock-Sands form sandstone; rough, gritty texture-Silt and clay form shale; smooth, soft, easily broken (p.128) 2. chemical rocks â formed from chemical sediments that precipitate out of water â Geodes form in this way! (sphere of silica rock filled with crystals)-other examples: rock salt (halite), some limestones. 3. organic rocks â formed from sediments made-up of the remains of plants and animals (clam shells, coral, bone)-examples: coal, limestone, coquina. Sedimentary rocks contain 3 distinct features: stratification: change in the type of sediment being laid down produces stripes or visible layers of rock