Bulletin, Volume 8

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Colorado Geological Survey, Department of Natural Resources, State of Colorado, 1915 - Clay - 353 pages

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Page 4 - Chairman, and Members of the Advisory Board of the State Geological Survey. GENTLEMEN : I have the honor to transmit herewith Bulletin 9 of the Colorado Geological Survey.
Page 105 - It is interesting to note that, contrary to what might be expected...
Page 18 - All the potash and soda were figured to feldspar. The alumina required for the feldspar was deducted from the total alumina, and the difference was taken as the starting-point from which to figure the kaolinite substance. The difference between the total silica (SiO2) and that required by both feldspar and kaolin gives the quartz and the silica in silicates other than those mentioned.
Page 87 - I. Residual, derived from: A. Granitic or gneissoid rocks. B. Basic igneous rocks. . C. Limestone or dolomite. D. Slate or shale. E. Sandstone. II. Transported by: A. Gravity assisted by water. Deposits near the heads and along the slopes of ravines. B. Ice. Deposits resulting mainly from the melting of the ice of the Glacial epoch. C. Water. 1. Marine. 2. Lacustrine. 3. Stream. D. Wind. Loess.
Page 84 - ... nickel, gold, silver or plated ware, buttons, and similar materials. China Clay (kaolin) and some pipe clays have been used successfully in polishing powders. Pipe clay at one time was the standard polish for naval and military tunic buttons. BATH BRICK, used for scouring steel utensils, is made from a very fine-grained, quartzose clay found along the banks of the Parrot River in England.
Page 23 - Seger has denned it as the property which solid bodies show of absorbing and holding a liquid in their pores, and forming a mass which can be pressed or kneaded into any desired shape, which it retains when the pressure ceases, and on the withdrawal of the water, changes to a hard mass.
Page 126 - ... refractory as the material found farther south; and equally promising clays occur from the Wyoming line to a point six miles therefrom, and possibly farther. There the bed varies from 2 to 6 feet in thickness. All these refractory samples came from the lower zone and are much like the southern ^aterial in their deficient plasticity, tensile strength, and cohesion.

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