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a red crystalline insoluble oxide of iron that occurs as haematite and rust and is made by heating ferrous sulphate: used as a pigment and metal polish (jeweller's rouge), and as a sensitive coating on magnetic tape, raua oksiid, milles raua oksüdatsiooniaste on +III
raud(III)oksiid . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/raud%28III%29oksiid/1/est (18.07.2026)
