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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. , (mineralogy) A variety of hematite that is pseudomorphic after magnetite crystals.

from the GNU version of the Collaborative International Dictionary of English

  • n. Iron sesquioxide in isometric form, probably a pseudomorph after magnetite.

from The Century Dictionary and Cyclopedia

  • n. Iron sesquioxid in isometric crystals, probably pseudomorph after magnetite. It occurs occasionally on a large scale, as in the Lake Superior iron region and the Cerro de Mercado in Mexico.

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