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Johannite

Named to honor Austrian Archduke Johann Baptist Josef Fabian Sebastian, the founder of the Landesmuseum in Graz, Austria. Johannite is an uncommon mineral that forms in oxidized, sulfide-bearing uraninite deposits, and usually forms post-mine. It can be found in localities in the Czech Republic, Germany, England, France, Tajikistan, Gabon, the United States, and Canada, among a couple others. Johannite is strongly radioactive. It will decompose in water and leaves a bitter or sour taste.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/johannite.pdf

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