amygdule

(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

sometimes called amygdale

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

See amygdule in American Heritage Dictionary 4

noun

A small gas bubble in igneous, especially volcanic, rock filled with secondary minerals such as zeolite, calcite, or quartz.

Origin:

Origin: Latin amygdala, almond (from its shape); see amygdala

Origin: + (nod)ule

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