| 释义 |
Definition of amygdale in English: amygdalenounəˈmɪɡdeɪl Geology A vesicle in an igneous rock, containing secondary minerals. Example sentencesExamples - Flow margins are often altered, containing abundant epidote and amygdales with quartz, calcite and/or chlorite.
- Flow tops were avoided as they are almost always riddled with amygdales and show signs of alteration.
- Some consist of pear-shaped segregation vesicles with amygdales at their upper margin.
- If, after the lava has cooled and set, the vesicles are filled with minerals, they are known as amygdales.
- Segregation vesicles are therefore distinguished from amygdales because they are infilled with chilled magma, whereas amygdales represent the infilling of vesicles from post-emplacement fluids.
Origin Late 19th century: from French, from Latin amygdala (see amygdala). |