amygdule

amygdule Definition

amyg·dule (ə mig′do̵̅o̅l′, -dyo̵̅o̅l′)

noun

a small gas pocket, usually found in volcanic rock, partly or completely filled with a mineral, esp. a zeolite, calcite, or quartz

Etymology: < L amygdala, almond: from the typical shape

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