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abundant andesite augite beautiful beds belt biotite black mica blocks blue-gray breccia buff building purposes building stone calcareous calcite carbonate cement cent City coarse color compact composition constituent construction contain County Creek crystalline crystals cubic dark decorative deposits diabase diorite dolomite durable exposure extensively quarried feet in thickness feldspar fine-grained formation fossil fragments furnish Geological gneiss grain granite granular green greenish groundmass hard hornblende inches Island layers light gray lime limestone magnesian limestone marble massive material mica miles mineral monumental mottled Mountain National Museum nearly obtained onyx oolitic ornamental orthoclase outcrops owing pink plagioclase polish porphyry portion present Professor pyrite pyroxene quarries quartz readily Report River rock sandstone schist serpentine siliceous Silurian slabs slate soft split stone occurs structure surface syenite texture tion town Triassic variety various varying veins Vermont vicinity Washington weather writer yellowish York
Seite 245 - Saudstoiies are composed of rounded and angular grains of sand so cemented and compacted as to form a solid rock. The cementing material may be either silica, carbonate of lime, an iron oxide, or clayey matter. Upon the character of this cementing material, more perhaps than upon the character of the grains themselves?, is dependent the color of the rock and Its adaptability for architectural purposes. If silica alone is present the rock is light colored and frequently so intensely hard that it can...
Seite 276 - Counties. At Amherst the quarries are located in a series of ledges which were once the shore cliffs of Lake Erie. The elevated position of the stones is a great advantage, since the light and uniform color seems due to the fact that this elevation produces a free drainage, and the stones have been traversed by atmospheric waters to such 'a degree that all processes of oxidation which are possible have been very nearly completed. The stone here as elsewhere varies considerably in character and solidity...
Seite 92 - The most interesting building material in the entire state of Maryland is the " Potomac marble," " calico rock " or " Potomac breccia," which has been used occasionally for the greater portion of the century.
Seite 327 - ... balls let fall from a considerable height. With such difficulties as these to contend with it is not surprising that the building should have been considered a wonder when completed, and that people coming to Boston from a distance made it a point to see and admire this great structure. The wonder, however, was not that the granite could be broken into shape by such methods, but "that stone enough could be found in the vicinity of Boston fit for the hammer to construct such an entire building....
Seite 53 - Serpentine is essentially a hydrous silicate of magnesia, consisting when pure of nearly equal proportions of silica and magnesia with from 12 to 13 per cent, of water. The massive varieties quarried for architectural purposes are always more or less impure. containing frequently from 10 to 12 per cent, of iron...
Seite 194 - Boston as early as 1737, but it was not until the early part of the present century that its use became at all general.
Seite 48 - Up to 1867 some 2,020 tons had been quarried and sold. In this latter year some 3,700 stoves were manufactured by one company alone. The business has been conducted upon a large scale ever since. The bed has been followed some 400 feet, and the present opening is some 40 feet wide, 80 feet long, and 80 feet deep. Other beds constituting a part of the same formation occur in Weare, Warner, Canterbury, and Eichmond, all of which have been operated to a greater or less extent.
Seite 63 - ... in Blanford and another in Pelham, in the southwest part of the town. The color of this last is dark, and the quantity of the talc is considerably large. A large bed occurs in connection with soapstone on the north side of Deerfield River, in Zoar, near the turnpike from Greenfield to Williamstown. Specimens from this place resemble those from the celebrated localities of this rock at Zoblitz, in Saxony.
Seite 399 - ... thus prevent all access of moisture. Whatever the substance, it must be of such a nature as in no way to discolor or disfigure the stone. Paint. — This is one of the substances most generally used and which has been employed on the porous sandstone of the Capitol, White House...
Seite 110 - England, p. 46. are three beds of marble running through the town, north and south. The most easterly has a breadth of some 200 feet, and the stone is of the same character as that at Sutherland Falls or Proctor, as the town is now called. The middle bed is separated from the first by about 200 feet of lime rock. The bed itself is some 400 feet wide, and the stone varies in color from pure white to dark blue. The third or west bed which is thought to correspond to that of West Rutland is about half...