minerals

walpurgite

metazeunerite

uranosphaerite

Trögerite

Formula: (H3O)(UO2)(AsO4).3H2O
Hydrated normal arsenate, meta-autunite group
Specific gravity: 3.3 to 3.55
Hardness: 2 to 3
Streak: White to pale yellow
Colour: Lemon-yellow to deep yellow
Solubility: Soluble in acids
RADIOACTIVE
Environments

Hydrothermal environments

Trögerite is a rare secondary mineral in the oxidation zone of some uranium deposits, usually found as crusts or aggregates of microscopic crystals. Zeunerite crystals commonly occur overgrowing trögerite in a parallel position (Mindat, HOM).

Localities

At the type locality, the Walpurgis Flacher vein, Weißer Hirsch Mine (shaft 3), Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany, trögerite occurs in the oxidised zone of a silver-nickel-arsenic-uranium deposit. Associated minerals include walpurgite, uranospinite, uranospathite, asselbornite, zeunerite, uranosphaerite, erythrite and cobaltoan manganese oxides (Mindat, Dana, HOM, AM 38.1159-1168).

At the Bota-Burum uranium deposit, Alakol, Almaty Region, Kazakhstan, trögerite occurs with realgar, orpiment, scorodite, mansfieldite, natrouranospinite, arseniosiderite, metatorbernite, metazeunerite, uranophane, arsenopyrite, pyrite and galena (HOM).

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