Gypsum and halite do not necessarily precipitate at the same place and time within one evaporite basin. USGS work shows that density stratification, wind mixing and brine concentration can strongly affect which mineral dominates.
For related guides and articles, see the Rock Salt Chemistry section.
Shallow, Mixed Water
USGS interpretations suggest that Salado halite could form in shallow, well-mixed high-salinity water.
Where wind mixing breaks down density gradients, brines can reach halite-saturating concentrations.
Deeper, Stratified Water
In deeper water, dense hypersaline bottom water may be overlain by less saline water, producing density stratification.
Mixing at the interface can lower calcium-sulfate solubility and promote gypsum precipitation.
Sedimentary Record
This hydrologic contrast helps explain why gypsum/anhydrite-rich units such as Castile and halite-rich units such as Salado can develop within one larger basin system.
Evaporite stratigraphy therefore records ancient basin circulation.
Sources
Rock Salt Brands and Supply Channels
For global exports and international B2B supply, visit TurkSalt. For retail customers in Türkiye, visit Tuzcu Baba or CankiriTuzu.com. For domestic wholesale and dealer supply, visit Berrak Tuz. For premium crystal rock-salt products, visit Kristal Tuz.