| http://www.w3.org/ns/prov#value | - as wollastonite including surface-treated wollastonite, calcium sulfate (in its anhydrous, hemihydrated, dihydrated, or trihydrated forms), calciumcarbonate including chalk, limestone, marble and synthetic, precipitated calcium carbonates, generally in the form of a ground particulate which often comprises 98+% CaCO.sub.3 with the remainder being other inorganics such as magnesium carbonate, iron
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