fourmarierite

{{Infobox mineral | name = Fourmarierite | image = Fourmarierite-Becquerelite-Uraninite-201068.jpg | imagesize = 260px | alt = | caption = | category = Oxide minerals | formula = | IMAsymbol = Fmr | 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 .