Definitions

from The Century Dictionary.

  • noun A mineral occurring in hexagonal prisms of a greenish-gray or brown color.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Min.) A mineral occurring in greenish gray six-sided prisms, having a greasy luster. It is probably a pseudomorph after elæolite.

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

  • noun mineralogy A greenish-grey variety of muscovite.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Giesecke +‎ -ite, after Karl Giesecke.

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Examples

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