| prov:value
| - Some examples are glass and quartz in the form of powders, beads and fibers, metal and semimetal oxides, carbonates, such as MgCO3, CaCO3 and dolomite, metal sulfates, such as gypsum and barite, naturally occurring and synthetic silicates, such as talc, zeolites, wollastonite and felspars, aluminas, such as china clay, rock powders, whiskers, carbon fibers, fibers or powders of plastics and carbon
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