Delvauxite

phosphate

vivianite

Formula: CaFe3+4(PO4)2(OH)8.4-5H2O
Hydrated phosphate containing hydroxyl
Specific gravity: 1.85
Hardness: 2½
Streak: Yellow, pale brown
Colour: Yellowish brown, brownish black, reddish, chestnut-brown
Environments


Gossan

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.

Back to Minerals