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Deutsche Mandel {f} [min.] Synonyme

mandel  

Englische amygdule; amygdale; geode Synonyme

amygdule Definition

amygdule Bedeutung

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Amygdules or amygdales form when the gas bubbles or vesicles in volcanic lava are infilled with a secondary mineral such as calcite, quartz, chlorite or one of the zeolites. Amygdules usually form after the rock has been emplaced, and are often associated with low-temperature alteration. Amygdules may often be concentrically zoned. Rocks containing amygdules can be described as amygdaloidal.