What is "bischofite"

n. (context mineral English) A saline evaporite, consisting of magnesium chloride with the chemical formula magnesiumchlorine₂'''·'''6water, found with potash deposits in Saxony.

Bischofite (bischofit) is a hydrous magnesium chloride mineral with formula MgCl·6HO. It belongs to halides and is a sea salt concentrate dated from the Permian Period (nearly 200 million years ago). Bischofite is ecologically pure natural magnesium poly-mineral with a unique composition. It contains many macro- and micro-elements vital for human health, in much higher concentrations than can be found in sea or ocean salt. The main bischofit compound is magnesium chloride (up to 350 g/L), moreover, it contains about 70 other elements as impurities, including potassium, sodium, bromine, boron, calcium, silicon, molybdenum, silver, zinc, iron and copper.