By: shelley-jaye
Image: Credit: Robin Rohrback, Mid-Atlantic Geo-Image Collection (M.A.G.I.C.) on GigaPan. CC BY Attribution 3.0 ⧉
License: Creative Commons Attribution ⧉

Uploaded: 6 Jan 2020
Last Updated: 15 Jan 2020

467 megapixels
31,524 x 14,824 pixels
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All of these samples are quartz, a framework silicate. Pure quartz (SiO2) is the clear sample on the left-hand side; followed by smoky quartz, rose quartz, and amethyst quartz. Each of the colored quartz samples contains an impurity in the chemistry.