Tranquillityite is a neat and rare mineral that was first found on the moon during the Apollo missions. It was later found in Australia in 2011 and this is where my piece came from.
Interesting articles:
https://www.cnet.com/news/diamonds-nah-burning-man-wedding-ring-holds-a-piece-of-the-moon/
https://gettingstoned.online/gem-blog/f/my-first-look-at-tranquillityite-which-was-found-on-the-moon