What Is Salt?
Sodium chloride or common salt is the chemical compound NaCl. Salt occurs naturally in many parts of the world as the mineral halite and as mixed evaporites in salt lakes. Seawater has lots of salt; it contains an average of 2.6% (by weight) NaCl, or 26 million metric tons per cubic kilometer. Underground salt deposits are found in both bedded sedimentary layers and domal deposits. Deposits have been found to have encapsulated ancient microorganisms including bacteria. Some salt is on the surface, the dried-up residue of ancient seas like the famed Bonneville Salt Flats in Utah. Salt even arrives on earth from outer space and its presence on the planet Mars makes scientists think life may exist there. Conversely, surface salt depositions and man-made saltworks can be seen from space.
Purity of rock salt produced in North America varies depending on the type of salt (evaporated, rock, solar) and on the source. Rock salt typically ranges between 95% and 99% NaCl, and mechanically evaporated salt and solar salt normally exceed 99% NaCl. Evaporated salt made with purified brine has the highest purity, in some cases 99.99% NaCl. Voluntary standards, such as those developed by the American Society for Testing and Materials (ASTM), the American Water Works Association (AWWA) assure appropriate quality for the intended use. Mandatory specifications for food grade, drug/medical and analytical use include Food Chemicals Codex, U.S. Pharmacopoeia, and Reagent Grade Chemicals. Special devices, refractometers, are used to measure salinity.
http://www.saltworks.us/salt_info/si_WhatIsSalt.asp
Dead Sea Salt Info : About The Dead Sea
The Dead Sea lies at the bottom of the Syrian - African Rift Valley, about 400 meters (1280 feet) below sea level. Known in Biblical times as the Eastern Sea, the Romans called it Mare Mortuum, the Israeli Geographic office called it The Sea of Salt. This remnant of the sea, which covered the area over two million years ago, is the lowest natural place on Earth. Its depth ranges from 1376 feet (430 meters) in the north to 32 feet (10 meters) in the south.The waters of the Dead Sea are unique, having a total salt concentration that is 10 times higher than ocean water, reaching 33% versus 3%. But that's not all! The composition of the brines is also unique, comprising magnesium, potassium and calcium chlorides, in addition to a high concentration of bromides.
http://www.saltworks.us/salt_info/si_DeadSeaSalt_Info.asp
Why is Epsom Salt called Epsom Salt?
One of the earliest discoveries of magnesium sulfate, the scientific name of Epsom Salt, occurred back in Shakespeare's day in Epsom, England, which explains the first half of the name. The term "salt" probably refers to the specific chemical structure of the compound, although many people mistakenly assume it refers to the crystalline structure of Epsom Salt, which has an appearance similar to that of table salt. (Table salt, of course, consists of sodium chloride, so it's an entirely different substance than magnesium sulfate.)
http://www.epsomsaltcouncil.org/about_faq.htm
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