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Variations in the Composition of Feldspar from a Hagerstown Soil Profile¹

ABSTRACT

Data have been presented showing the occurrence and chemical composition of the feldspar of the very fine separates of eight horizons of a virgin Hagerstown soil profile and from the dolomite upon which this soil profile has been developed. The feldspar which occurs in the parent rock is chiefly microcline with some weathered orthoclase. The orthoclase does not appear above the first twenty inches immediately above the rock but has been eliminated by weathering processes which appear to be similar to kaolinization. Above the first horizon adjacent to the parent rock the feldspars of the very fine sands appear to be microcline which in some cases is coated with a layer of material similar to a plagioclase as shown by microchemical tests in which weathering processes appear to be removing calcium as the surface is approached. Above the B horizon some sodium seems to have replaced calcium in a manner similar to the replacement of sodium by calcium in the plagioclase series of feldspars.

¹ Authorized for publication on December 21, 1938, as Paper No. 883 in the Journal Series of the Pennsylvania Agricultural Experiment Station, State College, Pennsylvania.

² Associate and Professor of Soil Technology, respectively.