What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
absorption air shrinkage arroya bed which dips Boulder Brick Brick bricks and earthenware Buff burned to Cone Calcite Canon cent clay Clays and Shales coal Coal Creek coarse-grained color Creek Dakota formation Dakota hogback easterly Economic Value exposure of material Fair feet north feet of overburden feet was sampled feet west feldspar Field Characteristics fine-grained clay fine-grained shale fire-clay flashed bricks fragile before burning Graneros gray grogged Gypsum hard hollow structural materials horizontal material kaolinite Laramie Laramie Formation Larimer limestone Limonite Location Medium-hard miles south Morrison formation Occurrence outcrop oxide paving-bricks Pierre formation pink soft-mud plasticity pressed bricks Probably worthless Pueblo red pressed bricks red soft-mud bricks rocks Roofing-Tile S.E. Cor Sand sandstone sandy clay sandy shale Siderite soft soft-mud and pressed stiff-mud bricks strikes Strong Strong Strong Strong Strong Weak temperature tensile strength terra cotta thick thicker exposure unvitrified floor tiles vitrified White yellow
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 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.