Product description : Formula MgSO4 Magnesium sulfate can crystallize as several hydrates, The most common is the heptahydrate MgSO4·7H2O, The heptahydrate takes its common name "Epsom salt" from a bitter saline spring in Epsom in Surrey, England.the size is the big crystal and small crystal. a Name of product : magnesium sulphate. b. Price of product : FOB Qingdao,China USD130/MT. c. Key Specifications/Special Features : 99.5% /technical grade, fertilizer grade, feed grade, food grade