1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
THORIANITE, a rare mineral, discovered by W. D. Holland, and found in the gem-gravels of Ceylon, where it occurs as small, heavy, black, cubic crystals, usually much water-worn. It was so named by W. R. Dunstan, on account of its high percentage of thorium (about 70% ThO2); it also contains the oxides of uranium, lanthanum, cerium and didymium. Helium is present, and the mineral is slightly less radio-active than pitchblende. It has been examined for new elements. Miss Evans (Journ. Chem. Soc., 1908, 93, p. 666) ob…
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- Vol. 26, pp. 878-878