World Library  
Flag as Inappropriate
Email this Article


Article Id: WHEBN0000466744
Reproduction Date:

Title: Amygdule  
Author: World Heritage Encyclopedia
Language: English
Subject: Volcanology, List of rock textures, Texture (geology), Cleveland Dyke, Thomsonite
Collection: Igneous Petrology, Volcanology
Publisher: World Heritage Encyclopedia


Amygdules in lava from Kaiserstuhl in Germany.

Amygdules or amygdales form when the gas bubbles or vesicles in volcanic lava (or other extrusive igneous rocks) are infilled with a secondary mineral such as calcite, quartz, chlorite or one of the zeolites.[1] Amygdules usually form after the rock has been emplaced, and are often associated with low-temperature alteration. Amygdules may often be concentrically zoned. Rocks containing amygdules can be described as amygdaloidal.

The word is derived from the Latin (amygdala) and Greek (αμυγδαλή) words for almond, reflecting the typical shape of an infilled vesicle.

"Amygdule" is more common in US usage, while "amygdale" is more common in British usage.


  1. ^ Grapes, Rodney H. (2011). Pyrometamorphism (2nd ed.). Berlin, Germany: Springer Verlag. p. 115.  

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.