Minerals | smithsonianmag.comhttps://www.smithsonianmag.com/rss/tag/minerals/RSS feed for MineralsenFri, 08 May 2026 17:42:41 +0000Mysterious Green Rocks Discovered in a Remote Cave in Spain Might Be Signs of Prehistoric People Working With Copperhttps://www.smithsonianmag.com/smart-news/mysterious-green-rocks-discovered-in-a-remote-cave-in-spain-might-be-signs-of-prehistoric-people-working-with-copper-180988706/The find challenges assumptions that people in the region thousands of years ago did not spend much time at high altitudesFri, 08 May 2026 17:42:41 +0000https://www.smithsonianmag.com/smart-news/mysterious-green-rocks-discovered-in-a-remote-cave-in-spain-might-be-signs-of-prehistoric-people-working-with-copper-180988706/Scientists Still Don't Know How or When the Grand Canyon Formed. New Research May Hint at Its Ancient Originshttps://www.smithsonianmag.com/smart-news/scientists-still-dont-know-how-or-when-the-grand-canyon-formed-new-research-may-hint-at-its-ancient-origins-180988570/Researchers say the ancestral Colorado River formed an ancient lake in northern Arizona roughly 6.6 million years ago, which spilled out westward onto the landscape that would eventually become the Grand CanyonFri, 17 Apr 2026 19:11:08 +0000https://www.smithsonianmag.com/smart-news/scientists-still-dont-know-how-or-when-the-grand-canyon-formed-new-research-may-hint-at-its-ancient-origins-180988570/