Online Encyclopedia

THORIANITE

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

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mineral, discovered by W . D . Holland, and found in the gem-gravels of
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Ceylon, where it occurs as small, heavy, black, cubic crystals, usually much
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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
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present, and the mineral is slightly less radio-active than pitchblende . It has been examined for new elements .
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Miss Evans (Journ . Chem .
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Soc., 1908, 93, p . 666) obtained what is possibly a new element, whilst M .

Ogawa (Journ .

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

End of Article: THORIANITE
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