This suggests the amethyst formed once the lava had cooled ... believe it likely originated from groundwater contained in rocks close by. Knowing this could help find more of these impressive ...

Geodes are hollow rock formations often with quartz crystals, such as amethyst, inside. Amethyst geodes in Uruguay have been found in cooled lava flows, which date from the original breakup of the ...

The Professor and Chair of Brock University's Department of Earth Sciences was a Participating Scientist in NASA's Mars Perseverance rover mission and has been analyzing ancient rocks found within ...