Amethyst Crystals In An Agate Geode
by Martin Land/science Photo Library
Title
Amethyst Crystals In An Agate Geode
Artist
Martin Land/science Photo Library
Medium
Photograph - Photograph
Description
A polished cross-section of a geode showing bands of agate and purple amethyst crystals growing into its cavity. Agate is a form of chalcedony (an opaque microcrystalline variety of the mineral quartz) that displays variegated bands or zones. Any colours it might have arise from the presence of various impurities. The multi-coloured concentric bands, visible here, represent successive layers of precipitation onto the interior surface of a rounded rock cavity. The purple colour of the amethyst crystals, which consist of another type of quartz, is caused by iron impurities.
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September 20th, 2018
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