fourmarierite

{{short description|Mineral}}

{{Infobox mineral

| name = Fourmarierite

| image = Fourmarierite-Becquerelite-Uraninite-201068.jpg

| imagesize = 260px

| alt =

| caption =

| category = Oxide minerals

| formula = {{chem|Pb|(U|O|2|)|4|O|3|(OH)|4|•4H|2|O|}}

| IMAsymbol = Fmr{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|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}}

| molweight =

| strunz = 4.GB.25

| dana =

| system = Orthorhombic

| class = Pyramidal (mm2)
H-M Symbol: (mm2)

| symmetry = Bb2₁m

| unit cell =

| color = Red, golden-red, brown

| colour =

| habit =

| twinning =

| cleavage = On {001}, perfect

| fracture =

| tenacity =

| mohs = 3 - 4

| luster = Adamantine

| streak =

| diaphaneity = Transparent

| gravity =

| density = 6.046 g/cm³

| polish =

| opticalprop =

| refractive =

| birefringence =

| pleochroism =

| 2V =

| dispersion =

| extinction =

| length fast/slow =

| fluorescence =

| absorption =

| melt =

| fusibility =

| diagnostic =

| solubility =

| impurities =

| alteration =

| other = 25px Radioactive

| prop1 =

| prop1text =

| references =

}}

Fourmarierite is a secondary uranium-lead mineral. It was named for the Belgian geologist Paul Fourmarier (1877–1970). Its chemical formula is {{chem|Pb|(U|O|2|)|4|O|3|(OH)|4|•4H|2|O|}}.{{cite web |url=http://webmineral.com/data/Fourmarierite.shtml |title=Fourmarierite Mineral Data |publisher=webmineral.com |accessdate= 15 May 2012}}