Delvauxite, also known as borickite, is a yellow to brown to dark brown amorphous mineral, sometimes forming a botryoidal mass.

[2] Its chemical formula is CaFe4(PO4,SO4)2(OH)8•(4-6)H2O.

It was first described in 1838 by Belgian geologist André Dumont and dedicate to chimist Charles Delvaux de Fenffe (1782–1863) who first analysed its chemical composition.

[2] It was found in Bernau, Liege, Belgium and Stredocesky, Czech Republic.

This article about a specific phosphate mineral is a stub.