Plural of amygdule; multiple small almond-shaped mineral deposits or cavities in volcanic rock.
Simple plural of amygdule. The term is used in geology and mineralogy to describe the characteristic features found in vesicular igneous rocks, particularly basalts and similar volcanic materials.
When geologists examine a piece of basalt with lots of tiny mineral-filled pockets, they describe it as 'amygdaloidal'—showing how this ancient almond-naming vocabulary is still actively used to describe rocks that cooled from molten lava!
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