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amygdule |
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amygduleSecondary 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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Sulfides are either
confmed to amygdules or disseminated in the basalts. |
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