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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 …
October 28, 2012
Geology Word of the Week: Z is for Zeolite
def. zeolite: The name of a large group of porous, framework, aluminosilicate (their basic structure is interlocking tetrahedra of SiO4 and AlO4) minerals that contain significant water and also significant exchangeable cations, which makes them absorbent materials. The name zeolite originates from the Greek words “zeo”, which means “to boil”, and “lithos”, which means “stone”. Zeolites were given their name because when you heat them, they generally release water in …
