A REE-bearing variety of uraninite. Presence of (Y,Ce, etc.)2O3 extends to at least 10%.
The first portions of terrestrial Helium (He) were obtained during Cleveite dissolution in sulfuric acid (Ramsey 23 March of 1895 - 27 years later of discovery of He on the Sun).
First described by Nordenskiöld (1878) from the Garta feldspar quarry, Arendal, Aust-Agder, Norway.
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 614.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Bjørlykke, H. (1934): The Mineral Paragenesis and Classification of the Granite Pegmatites of Iveland, Setesdal, Southern Norway. Norsk Geologisk Tidsskrift 14, 211-311
