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Fourmarierite
General
Category	Oxide minerals
Formula (repeating unit)	Pb(UO 2) 4O 3(OH) 4•4H 2O
IMA symbol	Fmr
Strunz classification	4.GB.25
Crystal system	Orthorhombic
Crystal class	Pyramidal (mm2) H-M Symbol: (mm2)
Space group	Bb21m
Identification
Color	Red, golden-red, brown
Cleavage	On {001}, perfect
Mohs scale hardness	3 - 4
Luster	Adamantine
Diaphaneity	Transparent
Density	6.046 g/cm
Other characteristics	Radioactive

Fourmarierite is a secondary uranium-lead mineral. It was named for the Belgian geologist Paul Fourmarier (1877–1970). Its chemical formula is Pb(UO
₂)
₄O
₃(OH)
₄•4H
₂O.

References

1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
2. "Fourmarierite Mineral Data". webmineral.com. Retrieved 15 May 2012.

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