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THORITE

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

mineral consisting of See also:thorium silicate, crystallizing in the tetragonal See also:system and isomorphous with See also:zircon. The theoretical See also:formula, ThSiO4, requires 81.5 % of thoria, but analyses show only 50-70%, there being also some See also:uranium, See also:cerium, &c. The mineral is almost always altered by hydration and is then optically isotropic and amorphous. Owing to See also:differences in See also:composition and to alteration, the specific gravity varies from 4.4 to 5.4. The See also:colour is usually See also:light See also:brown, but in the variety known as " orangite " it is See also:orange-yellow. The mineral occurs as isolated crystals and small masses in the See also:augite-See also:syenite near Brevik in See also:South See also:Norway; also at See also:Arendal, and in the See also:gem-gravels of See also:Ceylon. If found in larger amount it would be an important source of thoria for incandescent See also:gas mantles. (L. J.

End of Article: THORITE

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THORIUM (symbol Th, atomic weight ,232.42 [0=16])

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