The Nature of the Iron Compounds in Red and Yellow Sandstone

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Abstract
Samples of red and yellow oxides were prepared by Raleigh''s methods (1946) and studied by x-ray diffraction and the magnetic balance. Chalybeate water was prepd. by bubbling CO2 through dist. water in contact with iron shavings. The yellow oxide was prepd. by bubbling air through the soln., filtering, and drying the precipitate. The red oxide was made by dropping the chalybeate water on a rotating glass cylinder kept well below 100[degree]C. The red deposit was scraped from the cylinder. X-ray diffraction patterns of the yellow oxide proved it to be chiefly [alpha]Fe2O3. H2O. Some -yFe2O3.H2O was indicated by magnetic susceptibility figures. X-ray patterns of the red oxide showed the presence of hematite and [lambda]Fe2O3. A series of sandstones was analyzed. One specimen of red St. Peter''s sandstone from Mineral Point, Wisconsin, contained 0.32% iron as Fe2O3 and had a gross magnetic susceptibility of abt. 5 X 10-6. The sand was almost pure quartz. The iron oxide in the sample was found to have a high susceptibility (1,600 X 10-6) which could have originated only with [lambda]Fe2O3.

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