amygdule

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amygdule

[ə′mig‚dyül]
(geology)
A mineral filling formed in vesicles (cavities) of lava flows; it may be chalcedony, opal, calcite, chlorite, or prehnite.
An agate pebble.
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Sulfides are either confmed to amygdules or disseminated in the basalts.
White and in places red calcite and chlorite fill amygdules in part of the flow (of flows).
5 to 3 mm in length set in a groundmass that includes flow-aligned plagioclase microlites and amygdules infilled with chlorite, epidote and calcite (Fig.