Hydrated phosphate containing hydroxyl
Specific gravity: 1.85
Streak: Yellow, pale brown
Colour: Yellowish brown, brownish black, reddish, chestnut-brown
Delvauxite occurs in gossan (Webmin).
Associated minerals include diadochite, vivianite, pitticite, melanterite and limonite (HOM).
The type locality is the Château de Berneau, Dalhem, Liège, Wallonia, Belgium.
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