Amygdules or amygdales (/əˈmɪɡdjuːlz,-deɪlz/) form when the vesicles (pores from gas bubbles in lava) of a volcanic rock or other extrusiveigneous rock 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 word amygdala, meaning "almond tree", and the Greek word αμυγδαλή, meaning "almond" – reflecting the typical shape of an infilled vesicle. Amygdule is more common in American usage, while amygdale is more common in British usage.
See alsoedit
Phenocryst – Crystal larger than the rock grains that surround it in an igneous rock
Volcanic gas – Gases given off by active volcanoes
Referencesedit
^Grapes, Rodney H. (2011). Pyrometamorphism (2nd ed.). Berlin, Germany: Springer Verlag. p. 115. ISBN978-3-642-15587-1.
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amygdule, part, human, brain, amygdala, amygdales, form, when, vesicles, pores, from, bubbles, lava, volcanic, rock, other, extrusive, igneous, rock, infilled, with, secondary, mineral, such, calcite, quartz, chlorite, zeolites, usually, form, after, rock, bee. For part of the human brain see Amygdala Amygdules or amygdales e ˈ m ɪ ɡ dj uː l z d eɪ l z form when the vesicles pores from gas bubbles in lava of a volcanic rock or other extrusive igneous rock 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 Amygdules in lava from Kaiserstuhl in GermanyThe word is derived from the Latin word amygdala meaning almond tree and the Greek word amygdalh meaning almond reflecting the typical shape of an infilled vesicle Amygdule is more common in American usage while amygdale is more common in British usage See also editPhenocryst Crystal larger than the rock grains that surround it in an igneous rock Volcanic gas Gases given off by active volcanoesReferences edit Grapes Rodney H 2011 Pyrometamorphism 2nd ed Berlin Germany Springer Verlag p 115 ISBN 978 3 642 15587 1 nbsp This article about igneous petrology is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Amygdule amp oldid 1167398667, wikipedia, wiki, book, books, library,
