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THORIANITE

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Originally appearing in Volume V26, Page 878 of the 1911 Encyclopedia Britannica.
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THORIANITE , a rare See also:

mineral, discovered by W. D. See also:Holland, and found in the See also:gem-gravels of See also:Ceylon, where it occurs as small, heavy, See also:black, cubic crystals, usually much See also:water-worn. It was so named by W. R. See also:Dunstan, on See also:account of its high percent-See also:age of See also:thorium (about 70% ThO2); it also contains the oxides of See also:uranium, lanthanum, See also:cerium and See also:didymium. See also:Helium is See also:present, and the mineral is slightly less radio-active than See also:pitchblende. It has been examined for new elements. See also:Miss See also:Evans (Journ. Chem. See also:Soc., 1908, 93, p. 666) obtained what is possibly a new See also:element, whilst M.

Ogawa (Journ. See also:

Coll. Sci. See also:Tokyo, 1908, vol. 25) found indications of three new See also:species: one which he called nipponium, with an See also:equivalent See also:weight of about 5o and atomic weight too; the second with an equivalent of about 16.7; whilst the third yielded a radio-active See also:oxide.

End of Article: THORIANITE

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