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amygduleA gas cavity (vesicle ) in volcanic rock that has been filled with mineral matter such as calcite, chalcedony, or quartz.
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amygduleA small, bubble-like mass formed inside volcanic igneous rock from the entrapment of a bubble of gas.
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amygduleA small, bubble-like mass formed from volcanic igneous rock that solidified and a bubble of gas got trapped in the interior.
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amygduleA vesicle in volcanic rock that is filled with secondary minerals. Example: Zeolite-filled amygdules in basalt.
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amygdule
(geology) A rounded mass of secondary mineral found in volcanic rock
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