purity: 46% origin: Shandong, China appearance: white or yellowish flakes good quanlity ... mainly used for production of magnesium salt, such as magnesium oxide, magnesium hydroxide, magnesium carbonate, also used as raw ... , fire prevention board, shed support, partition board, magnesium the manhole covers, bath crock, door window frame ... higher than the effect of sodium chloride. magnesium chloride(46%)