# johannite

> English word · Noun

## Definitions
1. A rare green uranium sulfate mineral.

## Etymology
After Archduke John of Austria (1782-1859), the founder of the Landesmuseum Joanneum in Styria, Austria + -ite.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/johannite