meisserite

{{infobox mineral | name = Meisserite | category = Sulfate mineral | image = | imagesize = | alt = | caption = | formula = Na5(UO2)(SO4)3(SO3OH)(H2O) | IMAsymbol = Mss | strunz = | dana = | system = Triclinic | class = Pinacoidal () (same H-M symbol) | symmetry = P | unit cell = a = 5.32, b = 11.51, c = 13.56 [Å], α = 102.96°, β = 97.41°, γ = 91.46° (approximated); Z = 2 | color = Pale green to yellowish-green | colour = | habit = prismatic | twinning = | cleavage = {100} and {001}, fair | fracture = | tenacity = Very brittle | mohs = 2 | luster = Vitreous | streak = Very pale yellow | diaphaneity = Translucent to transparent | gravity = | density = 3.21 (calculated) (approximated) | polish = | opticalprop = Biaxal (-) | refractive = nα=1.51, nβ=1.55, nγ=1.56 (approximated) | birefringence = | pleochroism = Colorless (X), pale yellow (Y), pale greenish-yellow (Z) | 2V = 60o | dispersion = Weak | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = 25px Radioactive | references = }} Meisserite is a very rare uranium mineral with the formula Na5(UO2)(SO4)3(SO3OH)(H2O). It is interesting in being a natural uranyl salt with hydrosulfate (hydroxysulfate) anion, a feature shared with belakovskiite. Other chemically related minerals include fermiite, oppenheimerite, natrozippeite and plášilite. Most of these uranyl sulfate minerals was originally found in the Blue Lizard mine, San Juan County, Utah, USA. The mineral is named after Swiss mineralogist Nicolas Meisser.

==Association and origin== Meisserite is associated with other sulfate minerals: belakovskiite, johannite, chalcanthite, copiapite, ferrinatrite, and gypsum. It is resulting from post-mining oxidation of the primary uranium mineral - uraninite.