Amethyst Crystals
by Martin Bond/science Photo Library
Title
Amethyst Crystals
Artist
Martin Bond/science Photo Library
Medium
Photograph - Photograph
Description
Amethyst crystals. Amethyst is a purple variety of quartz or silica oxide (SiO2) that is itself usually white or clear. The colouring of amethyst is caused by compounds of iron or manganese. It occurs most usually as crystals formed inside voids or cracks in volcanic rocks.
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November 24th, 2019
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