Image: Lapworth Museum of Geology - Amethyst
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Description: A specimen of amethyst, a violet variety of quartz (silica/silicon dioxide).
Title: Lapworth Museum of Geology - Amethyst
Credit: Own work
Author: TomWG00
Usage Terms: Creative Commons Zero, Public Domain Dedication
License: CC0
License Link: http://creativecommons.org/publicdomain/zero/1.0/deed.en
Attribution Required?: No
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