Definitions

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 basalt formed by the action of water on volcanic ash

Etymologies

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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