Some sedimentary rock is formed from minerals that were once dissolved in water
Mineral precipitation from water results in the formation of chemical sedimentary rocks. When dissolved substances leave water, it precipitates.
A glass of water should be filled with salt (halite). In the water, the salt will disintegrate. The water, but not the salt, will evaporate if you place the container in a warm, dry environment (like Arizona). The concentration of salt rises as the water evaporates, and eventually the water will become saturated and be unable to dissolve any more salt. The salt will then precipitate in the glass as the water continues to evaporate and come out of solution.
Chemical sedimentary rocks typically referred to as evaporites are formed in this manner. Typically, they are composed of the minerals gypsum and halite (calcium chloride, or rock salt).
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