delvauxite

{{infobox mineral

|name = Delvauxite

|image = Delvauxite (48293950742).jpg

|image_size =

| category = Phosphate minerals

|color = Yellow to brown to dark brown

|formula = {{chem|Ca|Fe|4|(P|O|4|,S|O|4|)|2|(OH)|8|•(4-6)H|2|O}}| IMAsymbol = Dvx{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|journal=Mineralogical Magazine|volume=85|issue=3 |pages=291–320|doi=10.1180/mgm.2021.43 |bibcode=2021MinM...85..291W |s2cid=235729616 |doi-access=free}}

|mohs =

}}

Delvauxite, also known as borickite, is a yellow to brown to dark brown amorphous mineral, sometimes forming a botryoidal mass.http://www.webmineral.com/data/Delvauxite.shtml Webmineral Its chemical formula is {{chem|Ca|Fe|4|(P|O|4|,S|O|4|)|2|(OH)|8|•(4-6)H|2|O}}.http://rruff.geo.arizona.edu/doclib/hom/delvauxite.pdf Handbook of Mineralogy and it may sometimes form stalactites.

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