Neptunite is a mineral that can be found in the Magma Geode and the Omni Geode. It can also be dropped by black slimes.
Gifting[]
Neptunite is disliked by everyone except for the Wizard, who likes it.
Tailoring[]
Neptunite is used in the sewing machine with cloth to create a shirt. It is a black dye when used in the spool of the sewing machine with a dyeable clothing item in the feed.