rock salt

Rock salt, also known as halite, is the mineral form of sodium chloride (NaCl) that occurs naturally in evaporite deposits, typically left behind by the evaporation of ancient seawaters or salt lakes. These geological formations are found worldwide, with major deposits in locations such as the Himalayas, Poland's Wieliczka mine, and the Great Salt Lake basin. Rock salt exists as large, coarse crystals that are colorless, white, or pale yellow, though some deposits contain trace minerals that impart subtle colors such as pink or grey.

The mineral is extracted through mining or solution mining techniques, where water is injected into salt deposits and the resulting brine is evaporated. Rock salt has a clean, straightforward salty taste without the chemical additives present in refined table salt, though its larger crystal structure and lower iodine content distinguish it from table salt variants.

Rock salt is employed in cooking for seasoning, brining, and de-icing applications, though the latter is secondary to its culinary function. In the kitchen, it is ground or crushed for direct seasoning of dishes, dissolved in water for brining meats and vegetables, and used in salt-crust cooking methods where whole fish, poultry, or vegetables are encased and baked. Its large crystals make it ideal for finishing dishes, providing textural contrast and visual appeal. Rock salt is also favored in Asian cuisines—particularly Indian cookery, where it is known as sendha namak or black salt (a sulfurous variant)—and is fundamental to traditional preservation techniques and the preparation of salt-based condiments.