Tag Archives: seawater

Evaporating seawater: evaporites and salinas


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Salts form 3.5% (more commonly stated as 35 ppt) of seawater by mass. If you evaporate seawater, the following minerals precipitate out in this order (the reverse of their solubility):

1) Calcite (CaCO3)
2) Gypsum (CaSO4 * 2H2O)
3) Halite (NaCl)
4) Sylvite (KCl)

You can remember the order because it's alphabetical!
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