Trögerite Locality: Walpurgis Flacher vein, Weißer Hirsch Mine (Shaft 3), Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany Light yellow trögerite crystals and some green zeunerite crystals. Field of view 4 mm — Photo: Leon Hupperichs · CC BY-SA 3.0
Trögerite
Trögerite is an IMA-recognized mineral species in the arsenate class, with the chemical formula (H₃O)(UO₂)(AsO₄)·3H₂O.
It is a member of the Natroautunite structural group.
Key properties: Mohs hardness 2–3; specific gravity 3.3; Vitreous, pearly on {001} cleavage luster; optically uniaxial.
IMA symbol Tge, grandfathered status — known before the IMA’s founding, named in 1871.
A rare mineral formed in the oxidation zone of some uranium deposits.
It is found associated with Walpurgite, uranospinite, uranospathite, asselbornite, zeunerite, uranosphaerite, erythrite, cobaltian wad (Weisser Hirsch mine, Germany); realgar, orpiment.
The mineral was named to honor Mining Foreman R. Tröger, Schneeberg, Germany, who found the first specimens.