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Meaning of spherulite

spher•u•lite

Pronunciation: (sfer'oo-līt", -yoo-, sfēr'-), [key]
— n. Petrol.
  1. a rounded aggregate of radiating crystals found in obsidian and other glassy igneous rocks.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.