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is iron ore a mineral or a rock

Iron Ore: Sedimentary Rock Pictures, Definition More
Earth's most important iron ore deposits are found in sedimentary rocks. They formed from chemical reactionsbined iron and oxygen in marine and fresh waters. The two most important minerals in these deposits are iron oxides: hematite Fe2O3 andite Fe3O4. These iron ores have been mined to produce almost every iron and ste


Nearly all of Earth's major iron ore deposits are in rocks that formed over 1.8 billion years ago. At that time Earth's oceans contained abundant dissolved iron and almost no dissolved oxygen. The iron ore deposits began forming when theanisms capable of photosynthesis began releasing oxygen into the waters. This oxygenbined with the abundant dissolved iron to produce hematite orite. These minerals deposited on the sea floor in great abundance, forming what are now knowSee more on

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