| http://www.w3.org/ns/prov#value | - Useful are inorganic particles containing at least one of oxides and salts of metals such as Si, Al, Mg, Ca, Ba, Zn, and Mn, for example, oxides such as SiO2, Al2 O3, MgO, ZnO, MgCO3, CaCO3, CaSO4, BaSO4, and TiO2, sulfates, and carbonates, as well as spherical particles of organic compounds such as polystyrene, polyesters, polyamides, and polyethylene.
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