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Others in the field, however, dismissed the markings as natural phenomena, such as iron oxide deposits, which also look red.—Adam Kovac, Scientific American, 1 June 2026 Hematite, an abundant iron oxide better known as rust, and its one of the most common minerals on Earth.—Georgina Jedikovska, Interesting Engineering, 17 Apr. 2026 The sand here was created by the erosion of nearby Navajo sandstone, and the rock gets its reddish-orange color from the iron oxide mineral hematite.—Lydia Mansel, Travel + Leisure, 2 Apr. 2026 Tinted formulas often incorporate pigments such as iron oxides that interact with visible light differently than sunscreen actives alone.—Yannick Rigg, Forbes.com, 27 Mar. 2026 See All Example Sentences for iron oxide