I must start our foray into this month’s birthstone with a confession: I didn’t think amethyst would be exciting. I find it nice but kind of ho-hum. So I decided to go big and explore the origins of those enormous amethyst geodes suitable for making into bathtubs.

from https://blogs.scientificamerican.com/rosetta-stones/the-origin-of-amethysts-may-leave-you-tingly/