Ferrous, also known as ferrous sulfate, also known as copperas. Blue-green monoclinic crystals or granules, odorless. Chlorite is a chemical substance, which is ferrous sulfate crystal, columnar or granular aggregate and irregular block. Blue-green, green with streaks of white, strong thermal decomposition, soluble in water, glycerol, insoluble in ethanol. It can be used for preparing iron salts, iron oxide pigments, mordants, water purifiers, preservatives, disinfectants and the like.