1) Radioactive mineral 2) Uranium mineral
Found on
https://www.crosswordclues.com/clue/thorianite
Thorianite is a rare thorium oxide mineral, ThO2. It was originally described by Ananda Coomaraswamy in 1904 as uraninite, but recognized as a new species by Wyndham R. Dunstan. It was so named on account of its high percentage of thorium; it also contains the oxides of uranium, lanthanum, cerium, praseodymium and neodymium. Helium is present, and...
Found on
http://en.wikipedia.org/wiki/Thorianite
thorium dioxide mineral (ThO2) that is very heavy, hard, and coloured dark gray to brownish black or bluish black. Originally found as waterworn ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/t/42
Thorianite is a rare mineral found in Sri Lanka, and containing thorium, uranium, cerium and other rare earths. The percentage of throium oxide is as much as 70 in some specimens.
Found on
http://www.probertencyclopaedia.com/browse/HT.HTM
No exact match found.
