Evaporitesformed by chemical precipitation from

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Evaporites—formed by chemical precipitation from aqueous solution (ocean water)— halite examples of an evaporate rock (mineral) Form in inorganic chemical reaction, heat form sun causes water to evaporate form  seawater plus dissolved materials like chlorine, magnesium, sulfate, calcium, sodium,  carbonate, potassium, bicarbonate As H20 is removed dissolved materials become more concentrated in seawater. If enough water removed dissolved, materials become saturated in seawater, and if any  more H2) removed start to precipitate out of liquid. For Ex: if 50% of water removed form seawater—calcite (CaCO3) precipitates out and  limestone is formed. If 80% is removed, gypsum precipitates out. 90%--halite precipitates out More water is removed—anhydrite More water is removed—sylvite  Organic sedimentary rocks Coal-sedimentary rock composed primarily of carbon. Various grades of coal identified  based upon how deep coal has been buried (thus exposed to higher temperatures and  pressures). Smaller quantities of sulfur, hydrogen, oxygen & nitrogen Grades of coals are  Peat—Lowest Grade, Least C, Least Heat generation Lignite—60-75% C, 17-34% O, 6.0% H, 0.5-3% S Bituminous—75-91.5% C, 2.8%--10% O, 3.75-6% H, 1% S Anthracite—Highest grade, Most C, Most Heat Generation >91.5%, <2.5% O, <3.75% 
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