Magnesium carbonate suppliers usa. find where to buy products from suppliers in the usa, including: distributors, industrial manufacturers in america, bulk supplies and wholesalers of raw ingredients & finished goods.. search for products or services, then visit the american suppliers website for prices, sds or more information. you can also view suppliers in australia, nz or the uk. Wholesale magnesium carbonateselect 2020 high quality wholesale magnesium carbonate products in best price from certified chinese magnesium carbonate heavy manufacturers, magnesium carbonate precipitated suppliers, wholesalers and factory on made-in-china Magnesium carbonate is a basic hydrated mgco3 or a normal hydrated mgco3. it contains the equivalent of not less than 40.0 percent and not more than 43.5 percent of magnesium oxide (mgo). identification u2014 when treated with 3 n hydrochloric acid, it dissolves with effervescence, and the resulting solution responds to the tests for magnesium. Magnesium carbonate, light powder, usp is used in anti-acid preparations. all spectrum chemical usp products are manufactured, packaged and stored under current good manufacturing practices (cgmp) per 21cfr part 211 in fda registered and inspected facilities.