<Tr> <Td> </Td> <Td> This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations. (April 2010) (Learn how and when to remove this template message) </Td> </Tr> <P> Evaporite (/ ɪˈvæpəraɪt /) is the term for a water - soluble mineral sediment that results from concentration and crystallization by evaporation from an aqueous solution . There are two types of evaporite deposits: marine, which can also be described as ocean deposits, and non-marine, which are found in standing bodies of water such as lakes . Evaporites are considered sedimentary rocks and are formed by chemical sediments . </P> <P> Although all water bodies on the surface and in aquifers contain dissolved salts, the water must evaporate into the atmosphere for the minerals to precipitate . For this to happen, the water body must enter a restricted environment where water input into this environment remains below the net rate of evaporation . This is usually an arid environment with a small basin fed by a limited input of water . When evaporation occurs, the remaining water is enriched in salts, and they precipitate when the water becomes supersaturated . </P> <P> Marine evaporites tend to have thicker deposits and are usually the focus of more extensive research . They also have a system of evaporation . When scientists evaporate ocean water in a laboratory, the minerals are deposited in a defined order that was first demonstrated by Usiglio in 1884 . The first phase of the experiment begins when about 50% of the original water depth remains . At this point, minor carbonates begin to form . The next phase in the sequence comes when the experiment is left with about 20% of its original level . At this point, the mineral gypsum begins to form, which is then followed by halite at 10%, excluding carbonate minerals that tend not to be evaporites . The most common minerals that are generally considered to be the most representative of marine evaporites are calcite, gypsum and anhydrite, halite, sylvite, carnallite, langbeinite, polyhalite, and kainite . Kieserite (MgSO) may also be included, which often will make up less than four percent of the overall content . However, there are approximately 80 different minerals that have been reported found in evaporite deposits (Stewart, 1963; Warren, 1999), though only about a dozen are common enough to be considered important rock formers . </P>

When do minerals precipitate out of a solution
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