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/
https://static.scientificamerican.com/blogs/cache/file/3ADA2E33-3CC5-4E58-A4D5C2E19D2F4A6C_source.jpg?w=590&h=800&0D1E4229-B3AD-4526-9BCB9D2CDCE759E4