Salt is common pantry staple these days, but hundreds of years ago it was a valuable and often rare commodity that people ...

Rock salt is different. In certain regions of the world, buried hundreds of feet below the ground are remains of evaporated seas. This mineral — halite — gets harvested by drilling the rock ...

Sodium chloride (rock salt or halite) is often used on roads, driveways and sidewalks. It's relatively inexpensive and keeps ice from accumulating on surfaces. It can damage concrete, kill ...