from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hydrous magnesium sulfate mineral.

from the GNU version of the Collaborative International Dictionary of English

  • n. A hydrous sulphate of iron of a deep red color. It often occurs in botryoidal form.

from The Century Dictionary and Cyclopedia

  • n. A red or ocher-yellow mineral from Falun in Sweden, consisting of the hydrous sulphates of iron, magnesium, and calcium.


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