Origin of the Ethereum.

The Aetherium is a powerful and mystical crystal in Laputa. It’s the source of Laputa.

Source:

https://archive.org/details/castle-in-the-sky-definitive-version

https://ghibli.fandom.com/wiki/Castle_in_the_Sky#World_of_Laputa

https://www.reddit.com/r/ethtrader/comments/n4p3y8/the_original_ethereum_crystal_the_castle_on_the/

https://www.reddit.com/r/stevenuniverse/comments/vx5n4p/what_sort_of_gemsona_would_you_give_for_aetherium/