Cleveite - Wikipedia
WebCleveite is an impure radioactive variety of uraninite containing uranium, found in Norway. It has the composition UO 2 with about 10% of the uranium substituted by rare-earth elements. [2] It was named after Swedish chemist Per Teodor Cleve . Cleveite was the first known terrestrial source of helium, which is created over time by alpha decay ...
Cleveite: Mineral information, data and localities. - mindat.org
WebAbout Cleveite Hide. Formula: UO2. Name: In honour of Per Theodor Cleve (1840-1905)- Swedish chemist, mineralogist and oceanograph. A variety of Uraninite. A REE-and Th-bearing variety of uraninite. Presence of (Y, Ce, etc.)2O3 extends to …
Cleveite [not Clevite] and helium | UCL UCL Culture Blog
WebJan 11, 2013 · It transpires that cleveite is a radioactive mineral, a variety of uraninite (UO 2), containing up to 10% of the rare earth elements (Y, Ce etc). Named in honour or Per Theodore Cleve (1840-1905), a Swedish chemist and mineralogist, it was first described by Nordensköld in 1878 from the Garta Feldspar quarry, Arendal, Norway ( http://www ...
The History of Holding Helium - Smithsonian Magazine
WebAug 2, 2021 · It was discovered in 1868 as a yellow line in the spectrum of the solar corona, and named for Helios, the Greek god of the sun. William Hillebrand, chief chemist of the United States Geological...
Happy birthday, helium! | New Scientist
WebApr 8, 1995 · In March 1895, while examining the spectrum of the gases given off by a uranium mineral called cleveite, Ramsay spotted a mysterious yellow line. Lacking a good spectroscope, he sent gas samples...
Cleveite - The Mineral and Gemstone Kingdom
WebCleveite. Uraninite containing up to 10 percent rare earth elements. < Back.
Helium 150 Years After Its Discovery | Inside Science
WebAug 17, 2018 · It took another 27 years before helium was discovered on Earth inside a mineral called cleveite. As often happens in science, the discovery was again made around the same time by multiple people, in this case Scottish chemist William Ramsay and Swedish chemists Per Teodor Cleve and Nils Abraham Langlet.
Cleveite - chemeurope.com
WebCleveite is a radioactive mineral containing uranium and found in Norway. It is an impure variety of uraninite, and has the composition UO 2 with about 10% of the uranium substituted by rare earth elements. It was named after Swedish chemist Per Teodor Cleve.
Cleveite: Mineral information, data and localities.
WebA variety of Uraninite A REE-and Th-bearing variety of uraninite. Presence of (Y, Ce, etc.)2O3 extends to at least 10%. Related to bröggerite. The first portions of terrestrial Helium (He) were obtained during Cleveite dissolution in sulfuric acid (Ramsey 23 March of 1895 - 27 years after discovery of He in the Sun.)
Cool as helium | Nature Chemistry
WebJan 24, 2012 · Literally. It has the lowest melting and boiling points of all the elements — and below 2 K, it enters a superfluid state with no apparent viscosity and extremely high thermal conductivity. These...
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