Nordgauite

nordgauite

zwieselite

triplite

fluorapatite

Images

Formula: MnAl2(PO4)2(F,OH)2.5.5H2O
Hydrated phosphate
Specific gravity: 2.35
Streak: White
Colour: White to off-white
Environments

Pegmatites

Nordgauite is a late stage secondary hydrothermal mineral in altered zwieselite-triplite masses in a zoned granite pegmatite. Associated minerals include fluorapatite, sphalerite, uraninite, columbite-tantalite, phosphosiderite and whiteite-jahnsite (inclusions) (HOM).

Localities

At the type locality, the Hagendorf South Pegmatite, Hagendorf, Waidhaus, Neustadt an der Waldnaab District, Upper Palatinate, Bavaria, Germany, nordgauite and kayrobertsonite were found in association with fluorapatite in cavities in altered zwieselite-triplite at a depth of 60 to 67 m in the mine. Nordgauite occurs as millimetre-sized compact white rounded waxy nodules with fibrous rims (AJM 19.1.8-9). Nordgauite has formed as a late-stage hydrothermal phase in the secondary phosphate suite, the end-product of the decomposition of zwieselite-triplite. Associated minerals include fluorapatite, sphalerite, uraninite, columbite-tantalite, phosphosiderite, whiteite and jahnsite (Mindat).

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