palagonite

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pa·lag·o·nite

 (pə-lăg′ə-nīt′)
n.
A brown, yellow, or orange volcanic glass that is interstitial material in pillow lava or in amygdules and is formed through the hydration of tachylyte.

[German Palagonit, after Palagonia, municipality in southern Sicily where it is found.]

pa·lag′o·nit′ic (-nĭt′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.

palagonite

(pəˈlæɡəˌnaɪt)
n
(Minerals) a yellow basaltic glass
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014