1) Halide mineral 
Bischofite (bishofit) is a hydrous magnesium chloride mineral with formula MgCl2·6H2O. 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 huma...
(from the article `halogen element`)
Magnesium chloride