. The clays and clay industry of New Jersey. Clay; Clay industries. THE PHYSICAL PROPERTIES OF CLAY. in be more intensely colored by the same quantity than one with many clay particles. Iron oxide colors a clay yellow, brown, or red, depending on the form of oxide present. The greenish color of many of the Clay Marls is due to* the presence of the mineral The iron coloration is, however, often concealed by the black. Fig. 32. Showing grains of sand in a Clay Marl I, enlarged 115 diameters. M, mica; Q, quartz; F, feldspar; I,. lignite. coloration due to carbonaceous matter. It is o
. The clays and clay industry of New Jersey. Clay; Clay industries. THE PHYSICAL PROPERTIES OF CLAY. in be more intensely colored by the same quantity than one with many clay particles. Iron oxide colors a clay yellow, brown, or red, depending on the form of oxide present. The greenish color of many of the Clay Marls is due to* the presence of the mineral The iron coloration is, however, often concealed by the black. Fig. 32. Showing grains of sand in a Clay Marl I, enlarged 115 diameters. M, mica; Q, quartz; F, feldspar; I,. lignite. coloration due to carbonaceous matter. It is often more or less difficult to make even an approximate estimate of the iron content in a clay from its color. Thus, for example, two clays from the Perth Amboy district which were of nearly the same 1 See Iron, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ries, Heinrich, 1871-1951; Kümmel, Henry Barnard, 1867-; Knapp, George N. Trenton, N. J. , MacCrellish & Quigley, printers
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