The cleveite sample from which Ramsay first purified helium, in the collection of University College London[1]
Cleveite is an impure radioactive variety of uraninite containing uranium, found in Norway. It has the composition UO2 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 of the uranium and accumulates trapped (occluded) within the mineral. The first sample of helium was obtained by William Ramsay in 1895 when he treated a sample of the mineral with acid.[3] Cleve and Abraham Langlet succeeded in isolating helium from cleveite at about the same time.
Yttrogummite is a variant of cleveite also found in Norway.
^Kirk, Wendy L. "Cleveite [not Clevite] and helium". Museums & Collections Blog. University College London. Retrieved 18 August 2017.
^http://www.mindat.org/min-29957.html Mindat.
^https://archive.org/details/becquerelraysthe00raylrich Rayleigh, Robert and John Strutt, 1904, The Becquerel rays and the properties of radium, London, E. Arnold.
Cleveite is an impure radioactive variety of uraninite containing uranium, found in Norway. It has the composition UO2 with about 10% of the uranium substituted...
Nils Abraham Langlet, who found helium emanating from the uranium ore cleveite, which is now not regarded as a separate mineral species, but as a variety...
helium (in the same year discovered by William Ramsay) in the mineral cleveite. Langlet was the first to correctly define its atomic weight. He died in...
For the radioactive mineral, see Cleveite. Clevite, Inc. was a Cleveland, Ohio based manufacturing company, founded as the Cleveland Graphite Bronze Company...
uraninite as a result of alpha decay. Helium was first found on Earth in cleveite, an impure radioactive variety of uraninite, after having been discovered...
Earth, Ramsay, Cleve, and Langlet observed independently helium trapped in cleveite. 1869 D. I. Mendeleev Mendeleev arranges the 63 elements known at that...
(group name - asbestiform serpentine) Citrine (yellow variety of quartz) Cleveite (variety of uraninite) Clinochrysotile (polytype of chrysotile) Coltan...
Uranium dioxide is known to be absorbed by phagocytosis in the lungs. Cleveite Ducrete Uranium oxide Uranium glass Uranium tile Leinders, Gregory; Cardinaels...
1895 Sir William Ramsay Isolated helium on Earth by treating the mineral cleveite (a variety of uraninite with at least 10% rare earth elements) with mineral...
Ramsay also managed to isolate helium for the first time while heating cleveite, a mineral. In 1902, having accepted the evidence for the elements helium...
Additionally, Cleve and Abraham Langlet discovered helium in the mineral cleveite in 1895. Cleve discovered six forms of dichloronaphthalene and discovered...
to prove it was nitrogen, Ramsay analyzed a different uranium mineral, cleveite, and found a new element, which he named krypton. This finding was corrected...
the mineral cleveite. These samples are identified as helium by Norman Lockyer and William Crookes. It is independently isolated from cleveite in the same...
following year, Ramsay liberated another inert gas from a mineral called cleveite; this proved to be helium, previously known only in the solar spectrum...
Nils Abraham Langlet, who found helium emanating from the uranium ore cleveite.) 1869: Dmitri Ivanovich Mendeleyev published his periodic table of chemical...
United States Geological Survey Frank Wigglesworth Clarke (1847–1931) Cleveite (uraninite var.): UO2 · UO3 · PO · ThO2 – Swedish chemist Per Teodor Cleve...
(1925). Détermination du poids atomique du mélange isotopique de plomb de la clévéïte de Aust-Agder, Norvège. Journal de Chimie Physique, 22, 253-263....
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