A lemon-yellow radioactive mineral consisting of hydrated vanadate of uranium and potassium, often found near petrified trees.
- Autunite is relatively abundant locally in Paleozoic-age sedimentary rocks in the vicinity of Jim Thorpe, Carbon County, Pennsylvania, where it is associated with carnotite and a variety of other uranium minerals.
- The most common ore of the element is pitchblende, although it is also present in other minerals, such as uraninite, carnotite, uranophane, and coffinite.
- It is found in a number of minerals, including vanadinite, carnotite, roscoelite, and patronite.
Late 19th century: named after Marie Adolphe Carnot (1839–1920), French inspector of mines, + -ite1.
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