Definitions

from The Century Dictionary.

  • noun In mining and geology, a nodule or concretion, such as flint or pyrite, in some other and usually softer rock, as chalk, clay, or coal.
  • noun Same as niblick.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy A rounded mass, as of flint in chalk, or of ironstone in coal.

Etymologies

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