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November 4, 2012

Geology Word of the Week: A is for Amygdale

def. Amygdale (also spelled Amygule): Vesicles, generally in extrusive igneous rocks, that are filled with secondary minerals, most commonly quartz, calcite, chlorite, and zeolite. When a rock contains amygdales, geologists often describe it as an amygdaloidal rock. For example, basalt is often described as amygdaloidal basalt. Here are a few previous, related geology words of the week that may be of interest: V is for Vesicle (and Vug) Z is …

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April 27, 2011

Geology Word of the Week: V is for Vesicle (and Vug)

Vesicles in basalt, image courtesy of Ron Schott of the Geology Home Companion Blog. def. Vesicle:A small cavity in a volcanic rock that was formed by the expansion of a bubble of gas that was trapped inside the lava.Vesicles are commonly found in volcanic rocks– that is, in rocks that solidified from lava. As you might remember from M is for Magma, lava is what you call molten rock when …

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