page_title: Amygdule
hierarchical_section_title: Amygdule
caption_attribution_description: Amygdales/amygdules (filled vesicles) of apatite &amp; quartz in a basaltic lava from the Kaiserstuhl, Southern Germany
context_page_description: Amygdules or amygdales form when the gas bubbles or vesicles in volcanic lava are infilled with a secondary mineral such as calcite, quartz, chlorite or one of the zeolites. 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" for almond tree and the Greek word "αμυγδαλή" 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.
context_section_description: 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. 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" for almond tree and the Greek word "αμυγδαλή" 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.
caption: Amygdules in lava from Kaiserstuhl in Germany.
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