from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A greenish-grey variety of muscovite.
from the GNU version of the Collaborative International Dictionary of English
- n. A mineral occurring in greenish gray six-sided prisms, having a greasy luster. It is probably a pseudomorph after elæolite.
from The Century Dictionary and Cyclopedia
- n. A mineral occurring in hexagonal prisms of a greenish-gray or brown color.
Giesecke + -ite, after Karl Giesecke. (Wiktionary)
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