Fourmarierite

Fourmarierite
File:Fourmarierite-Becquerelite-Uraninite-201068.jpg
General
Category	Oxide minerals
Formula	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/cm3
Other characteristics	File:Radioactive.svg 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.