Filling agents, thickeners, etc. Industrial calcium carbonate powder is a commonly used inorganic compound that is widely used in different industrial fields. The most important uses are as fillers, thickeners, bleaches and modifiers. Calcium powder, commonly known as limestone and stone powder, is mainly composed of calcium carbonate, which is weakly alkaline, difficult to dissolve in water, and soluble in acid. Calcium powder distribution It is a common substance on the earth and exists in rocks such as aragonite, calcite, chalk, limestone, marble, and travertine.