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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References in periodicals archive ?
Near the top of this unit is a zone of brecciated scoria, slag-like basalt containing numerous amygdules, all less than 2.
It contains numerous small pipe amygdules lined or totally filled with albite and calcite.
Prehnite pseudomorphs after glauberite are widespread within the diapiric amygdules of the first and second flows.
The amygdules are generally filled with white minerals, and give the dark, brownish gray rock a spotted appearance.
The mineral was found as a transparent, yellow to orange crystalline filling in amygdules 2-5 mm across, in a dark sill rock with a spotted appearance (A.