A variety of [Uraninite] (q.v.) rich in rare earths and helium. Cer = 2·3-2·9; Yttr = 10·0-10·3; ThO₂ = 4·6-4·8%.
Cubic; usually massive.
G = 7·49. H = 51⁄2. Black; opaque.
Arendal, Norway.
Cordylite.
Fluocarbonate of Cerium metals and Ba; E₂F₂Ba(CO₃)₃. Cer = 49·4%.
Hexagonal; isomorphous with [Parisite] (q.v.).
G = 4·31. H = 41⁄2. Yellow; transparent.
Plain of Narsarsuk, Greenland.