from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An iron-rich clay mineral of the montmorillonite group

from the GNU version of the Collaborative International Dictionary of English

  • n. A greenish yellow or green mineral, consisting chiefly of the hydrous silicate of iron.

from The Century Dictionary and Cyclopedia

  • n. Hydrated silicate of iron; a variety of chloropal occurring in small yellow nodules embedded in an ore of manganese. It is found in France in the arrondissement of Nontron, department of Dordogne.


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