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spherulite

[sfer-oo-lahyt, -yoo-, sfeer-]
noun Petrology.
  1. a rounded aggregate of radiating crystals found in obsidian and other glassy igneous rocks.
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Origin of spherulite

First recorded in 1815–25; spherule + -ite1
Related formsspher·u·lit·ic [sfer-oo-lit-ik, -yoo-, sfeer-] /ˌsfɛr ʊˈlɪt ɪk, -yʊ-, ˌsfɪər-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for spherulite

spherulite

noun
  1. any of several spherical masses of radiating needle-like crystals of one or more minerals occurring in rocks such as obsidian
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Derived Formsspherulitic (ˌsfɛrʊˈlɪtɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012