is a type of rock salt of natural origin. Extracted for over 250 million years from the Khewra mines, located in the ...

The basin contains a sedimentary rock record of up to 5 km (16,000 ft ... including coral reef networks and overlying salt deposits. Series of rock cores taken from major oil producing (and other) ...

For instance, halite — the natural form of sodium chloride (NaCl), from which table salt is made ... There are three main types of rock — igneous, sedimentary and metamorphic — with ...