a = 14.0135(6), b = 20.7121(8), c = 6.9959(3) [Å]; Z = 4
Identification
Formula mass
986.26 g/mol
Color
Lemon-yellow to sulfur-yellow, greenish yellow to pale green; may be dark green to greenish black
Crystal habit
Tabular crystals, foliated or scaly aggregates, and in crusts
Twinning
Rare on {110}
Cleavage
{001} perfect, {100} and {010} poor
Fracture
uneven
Mohs scale hardness
2–2.5
Luster
Vitreous – pearly
Streak
Pale yellow
Diaphaneity
Transparent to translucent
Specific gravity
3.1–3.2
Density
3.15
Optical properties
Biaxial (−)
Refractive index
nα = 1.553 – 1.555 nβ = 1.575 nγ = 1.577 – 1.578
Birefringence
δ = 0.003
Pleochroism
X = colorless to pale yellow; Y = Z = yellow to dark yellow
2V angle
Measured: 10° to 53°
Ultraviolet fluorescence
Strong yellow-green fluorescence in UV; Radioactive
Solubility
Soluble in acids
Alters to
Dehydrates in air
Other characteristics
Pseudotetragonal for synthetic material, Radioactive
References
[2][3]
Autunite (hydrated calcium uranyl phosphate), with formula Ca(UO2)2(PO4)2·10–12H2O, is a yellow-greenish fluorescent phosphate mineral with a hardness of 2–2+1⁄2.[4][5] Autunite crystallizes in the orthorhombic system and often occurs as tabular square crystals, commonly in small crusts or in fan-like masses. Due to the moderate uranium content of 48.27% it is radioactive and also used as uranium ore. Autunite fluoresces bright green to lime green under UV light. The mineral is also called calco-uranite, but this name is rarely used and effectively outdated.[6]
Autunite was discovered in 1852 near Autun, France, which is also autunite's namesake. It occurs as an oxidation product of uranium minerals in granite pegmatites and hydrothermal deposits. Associate minerals include metaautunite, torbernite, phosphuranylite, saleeite, uranophane and sabugalite.[3]
Autunite (hydrated calcium uranyl phosphate), with formula Ca(UO2)2(PO4)2·10–12H2O, is a yellow-greenish fluorescent phosphate mineral with a hardness...
secondary mineral. The chemical formula of torbernite is similar to that of autunite in which a Cu2+ cation replaces a Ca2+ cation. Torbernite tends to dehydrate...
minerals, including uraninite (the most common uranium ore), carnotite, autunite, uranophane, torbernite, and coffinite. Significant concentrations of uranium...
in a yellow green, and is the cause of fluorescence of minerals such as autunite or andersonite, and, at low concentration, is the cause of the fluorescence...
made small shipments in 1954 and 1955. Uranium occurs as uraninite and autunite in shear zones in granodiorite. Accessory minerals include fluorite and...
mineral with formula Cu(UO2)2(AsO4)2·(10-16)H2O. It is a member of the autunite group. The associated mineral metazeunerite is a dehydration product of...
closely associated with torbernite, but is also found amongside autunite, meta-autunite and uraninite. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols"...
Structures and Synthesis of the Copper-Dominant Members of the Autunite and Meta-Autunite Groups: Torbernite, Zeunerite, Metatorbernite and Metazeunerite"...
elements could be a defining constituent, such as uranium in uraninite, autunite, and carnotite, or present as trace impurities, as in zircon. The decay...
beginning of the modern oil-shale industry. In 1852, the uranium mineral autunite was first discovered near Autun, and named for the town. Autun is the main...
the "meta-autunite group" with number VII/E.02 together with abernathyite, bassetite, chernikovite, lehnerite, meta-ankoleite, meta-autunite, meta-heinrichite...
analysed wavellite, tourmaline, and the uranium minerals torbernite and autunite, the arsenate scorodite, the lead mineral mimetite and the nickel mineral...
Specimens of the rare uranium minerals, such as uranophane, torbernite, and autunite, have been found. Sam Ruggles (3 August 1770 – 27 May 1843) started the...
physical cue to coordinate ECM production by the bacterial community. Autunite crystal Biomineralization may be used to remediate groundwater contaminated...
U-238 Atomic Energy Laboratory, which contained radioactive ore samples of autunite, carnotite, torbernite and uraninite.: 179 In 1908, he married Mary Thompson...
Agjrs Austinite Aus Aheylite Ahe Amarantite Ama Argentoliveingite Aliv Autunite Aut Ahlfeldite Afe Amarillite Amr Argentopearceite Apea Avdeevite Avd Ahrensite...
uranium was produced from 1825 until 1898. In 1852, the uranium mineral autunite from the Massif Central was identified. Around 1850, uranium mining began...
Quechua orogeny, forming the Aguiliri centre.: 3–4 The uranium mineral autunite is found in the country rock surrounding the dome. This mineral was probably...
dozens of other uranium minerals such as carnotite (KUO2VO4·3H2O) and autunite (Ca(UO2)2(PO4)2·nH2O). The isotopic composition of natural uranium is 238U...
Formation and the subjacent Precambrian schist. The veins contain pitchblende, autunite and uranophane, with accessory marcasite and barite. Extraction started...
member of the autunite group, found at the Jáchymov ore district (type locality), Czech Republic and in Schneeberg, Germany. The autunite group is a group...
depressions or flexures in the granitic contact. Shallow ore is mainly autunite. Deeper ore is pitchblende and coffinite with abundant pyrite and marcasite...
Global Information
Radioactive