spherulite
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spher·u·lite
(sfîr′yə-līt′, -ə-līt′, sfĕr′-)n.
A small, usually spheroidal body consisting of radiating crystals, found in obsidian and other glassy lava rocks.
spher′u·lit′ic (-lĭt′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
spherulite
(ˈsfɛrʊˌlaɪt)n
(Minerals) any of several spherical masses of radiating needle-like crystals of one or more minerals occurring in rocks such as obsidian
spherulitic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
spher•u•lite
(ˈsfɛr yʊˌlaɪt, ˈsfɪər-)n.
a rounded aggregate of radiating crystals found in obsidian and other glassy igneous rocks.
[1815–25]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.