abernathyite

{{Infobox mineral | name = Abernathyite | category = Arsenate minerals | image = Abernathyite, Heinrichite-497484.jpg | imagesize = 260px | caption = Pale yellow abernathyite crystals and green heinrichite crystals | formula = K(UO2)(AsO4)·3H2O |IMAsymbol=Abn | molweight = | strunz = 8.EB.15 | dana = 40.2a.9.1 | system = Tetragonal | class = Ditetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m) | symmetry = P4/ncc | unit cell = a = 7.176, c = 18.126 [Å] Z = 4 | color = Yellow | habit = | twinning = | cleavage = Perfect on {001} | fracture = | tenacity = Brittle | mohs = 2.5–3 | luster = Sub-Vitreous, resinous, waxy, greasy | polish = | refractive = nω = 1.597 – 1.608nε = 1.570 | opticalprop = Uniaxial (−) | birefringence = δ = 0.027 – 0.038 | 2V = 5° (measured) | dispersion = | pleochroism = Weak | fluorescence= Yellow-green in longwave and shortwave UV | absorption = | streak = Pale yellow | gravity = 3.32 (measured) 3.572 (calculated) | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent | other = 25px Radioactive | references = }} Abernathyite is a mineral with formula K(UO2)(AsO4)·3H2O. The mineral is named after Jesse Evrett Abernathy (1913–1963) who first noted it in 1953 in the U.S. State of Utah. It was described as a new mineral species in 1956. Abernathyite is yellow and occurs as small crystals.

==Description== Abernathyite is a transparent, yellow mineral that occurs as tabular crystals up to . The mineral has a single perfect cleavage on {001}. Abernathyite fluoresces yellow-green in longwave and shortwave ultraviolet. Because of its uranium content, the mineral is radioactive.