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Encyclopedia Britannica



THORIANITE

This article appears in Volume V26, Page 878 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: THE-TOO
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 percent-age 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) obtained what is possibly a new
element
 , whilst M. Ogawa (Journ.
Coll
 . Sci.
Tokyo
 , 1908, vol. 25) found indications of three new species: one which he called nipponium, with an equivalent
weight
  of about 5o and atomic
weight
  too; the second with an equivalent of about 16.7; whilst the third yielded a radio-active
oxide
 .


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