Amethyst is February’s birthstone! These gigantic geodes are dazzling purple now, but they would have originally been colorless. Their distinctive amethyst hue derives from millennia of natural radiation, heat, and trace contaminants. The geodes are composed of quartz, which is the second-most common mineral on Earth and makes up most of the sand on our planet’s beaches.🏖️ #learnontiktok #cleantok #STEM #geology #museumtok