Gemstones - you know, diamonds, rhodochrosites and the like - are our best friends. Catch "Treasures of the Earth: Gemstones" tonight at 9 on NOVA. ・・・ Repost @nova_pbs: The raspberry-colored Rhodochrosite mineral was originally discovered in the silver mines of Romania—but now, it's Argentina's "national gemstone." Some scientists now believe that microbial life helped give rise to hundreds of present-day minerals like Rhodochrosite. You can learn more by watching "Life's Rocky Start."
