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The scientists proceeded to mix ferric nitrate with potassium hydroxide, creating a hard iron oxide mineral called nanocrystalline ferrihydrite, which occurs naturally in soil and water.—Ben Coxworth, New Atlas, 29 Apr. 2025 For decades, spacecraft and rovers have gathered data pointing to a familiar explanation behind Mars' redness: the rusting of iron minerals, namely iron oxide, in the planet's dust.—Victoria Corless, Space.com, 25 Feb. 2025 The samples are mostly water-rich clay, with sulfide, carbonate, and iron oxide minerals.—Ars Technica, 30 Jan. 2025 The samples are mostly water-rich clay, with sulfide, carbonate and iron oxide minerals.—Sara Russell, The Conversation, 29 Jan. 2025 See All Example Sentences for iron oxide
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