Mathesiusite

mathesiusite

adolfpateraite

cejkaite

zippeite

Images

Formula: K5(UO2)4(SO4)4(VO5)(H2O)4
Valence: K5(U6+O2)4(S6+O4)4(V5+O5)(H2O)4
Uranyl sulphate vanadate
Crystal System: Tetragonal
Specific gravity: 4.02 calculated for the empirical formula
Hardness: 2
Streak: Greenish white
Colour: Yellowish green
Luminescence: Strong yellowish green under long and short wave UV
Environments

Hydrothermal environments

Localities

At the type locality, the Geschieber vein, Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic, mathesiusite occurs on fractures of gangue associated with adolfpateraite, schoepite, čejkaite, zippeite, gypsum and a new un-named K-UO2-SO4 mineral. It is a secondary mineral formed during post-mining processes. Acicular aggregates of mathesiusite consist of prismatic crystals up to about 200 microns long and several microns thick (AM 99.4.625-632).
Mathesiusite from the Geschieber vein - Image

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