| http://www.w3.org/ns/prov#value | - Examples of the metal oxides according to the present invention are metal oxides comprising a single -metal such as silicon oxide, titanium oxide, aluminum oxide, iron oxide, zirconium oxide, cerium oxide and complex or composite oxides such as calcium silicate, aluminum silicate, magnesium silicate, zeolite, feldspar, kaolinite, clay, talc.
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