Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A compact siliceous rock resembling jasper.

from the GNU version of the Collaborative International Dictionary of English

  • n. A compact siliceous rock resembling jasper.

from The Century Dictionary and Cyclopedia

  • n. In petrography, originally an acid igneous rock more silicious than rhyolite; as now used, in the Lake Superior region, a rock consisting of bands of red chert and hematite.

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