Specifically, for example, art related to a water absorbent including powder of an inorganic substance and powder of a water absorbent resin is disclosed in Patent Document 9 (U.S. Pat. No. 4,734,478), Patent Document 10 (Japanese Publication for Unexamined Patent Application, Tokukaisho 59-80458), and Patent Document 11 (U.S. Pat. No. 5,453,323).