from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A rock formation that resembles beads, found in glassy igneous rocks.
  • n. Archaic A pearl.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A calcium-rich member of the mica group of phyllosilicates, forming white to pinkish or yellowish-gray masses or thin laminae.
  • n. pearl

from the GNU version of the Collaborative International Dictionary of English

  • n. A pearl.
  • n. A mineral related to the micas, but low in silica and yielding brittle folia with pearly luster.

from The Century Dictionary and Cyclopedia

  • n. A pearl.
  • n. A mineral of micaceous structure, separable into thin laminæ which are rather brittle.
  • n. In lithology, an arrangement of the devitrification products (globulites) of a glassy material into forms resembling strings of beads: a term introduced by Vogelsang.
  • n. Same as margarita, 1.


Ultimately from Greek margarītēs, pearl, probably of Iranian origin.
(American Heritage® Dictionary of the English Language, Fourth Edition)
-ite (Wiktionary)



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