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amygdule

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amygdule

Secondary deposit of minerals found in a rounded, elongated, or almond-shaped cavity in volcanic rock. The cavities (vesicles) were created by the expansion of gas bubbles or steam within lava. Because gas bubbles tend to rise through the lava, amygdules are most common near the tops of flows. Many minerals have been found as amygdules, including some spectacular museum specimens of zeolites.

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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Viljoen and Viljoen (1969) recognized that many high-Mg rocks in the Barberton greenstone belt were lava flows of significant lateral extent and thickness, with chilled of brecciated tops, amygdules, pillows and the distinctive quench textures that were subsequently named "spinifex" (after an Australian spiky grass--Triodia spinifex).
Igneous rock associations 10. Komatiites by Dostal, Jaroslav / Geoscience Canada
Sulfides are either confmed to amygdules or disseminated in the basalts.
Government geoscience stimulates mineral exploration in the superior ... by Simard, Martin / Geoscience Canada
 
 
 
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