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mineraali magnetiit (Fe3O4) sisaldav rauamaak (vt magnetiit), a naturally magnetic rock because it consists of almost pure magnetite (see: magnetite)
black iron ore . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/black%20iron%20ore/1/eng (19.06.2026)