from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
from The Century Dictionary.
- noun A volcanic rock closely allied to basalt and having a decidedly vitreous structure.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A material similar to
basaltformed by the action of wateron volcanic ash
from The American Heritage® Dictionary of the English Language, 4th Edition
[German Palagonit, after Palagonia, municipality in southern Sicily where it is found.]
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