Metakahlerite

metakahlerite

cafarsite

scorodite

uraninite

Images

Formula: Fe2+(UO2)2(AsO4)2.8H2O
Hydrated arsenate, meta-autunite group, uranyl mineral
Crystal System: Triclinic
Specific gravity:
Hardness: 2 to 3
Streak: Pale yellow
Colour: Sulphur-yellow
Luminescence: Not fluorescent
Environments

Hydrothermal environments

Metakahlerite occurs as a secondary mineral in the oxidised zone of uranium-arsenic bearing deposits (HOM).

Localities

At the Knichte section, Lölling mining district, Hüttenberger Erzberg, Hüttenberg, Sankt Veit an der Glan District, Carinthia, Austria, metakahlerite is associated with arseniosiderite, scorodite, löllingite, uraninite and siderite (HOM).

At the type locality, Sophia Mine, Böckelsbach valley, Wittichen, Schenkenzell, Rottweil, Freiburg Region, Baden-Württemberg, Germany, metakahlerite was found as rare, sulphur-yellow scaly aggregates in the Sophia Shaft (AM 45.254).
Metakahlerite from the Sophia Mine - Image

At the Monte Cervandone area, Devero Alp, Baceno, Verbano-Cusio-Ossola Province, Piedmont, Italy, tiny olive-green crystals and encrustations of metakahlerite have been found in Mättital, resting directly on weathered cafarsite. Other closely related uranium species such as meta-autunite, metatorbernite and metazeunerite are also known from the region MinRec 56.3.318).

At the Southwick Cliffs, near Dalbeattie, Dumfries and Galloway, Scotland, UK, metakahlerite is associated with kahlerite (HOM).

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