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Which other minerals can precipitate from evaporating seawater along with rock salt?
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salt dome
Figure 1: Interrelationships of salt structures (see text)
When seawater evaporates, minerals precipitate in an orderly sequence based on their solubility, with less soluble components forming first. Along with rock salt (halite), the following minerals commonly precipitate from evaporating seawater:12
- Sulfates: Gypsum and anhydrite are the most prominent, typically forming early in the evaporation process.132
- Carbonates: Minerals such as calcite, dolomite, magnesite, and aragonite are often present.12
- Potassium and Magnesium Salts: Highly soluble minerals, including sylvite and carnallite, precipitate during the final stages of evaporation when the brine reaches high salinity.132
Additionally, depending on specific environmental conditions, various borates, silicates, nitrates, and sulfocarbonates may also be found in evaporite deposits.12