Report of Progress, Ausgabe 2Board of Commissioners for the Second Geological Survey, 1875 35 vols. are atlases. |
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Alumina analysis analyzed basal beautiful Berks county botryoidal brown brownish calcite carbonate cent Chester county chrome cleavable cleavage color colorless compact composition contains copper Cornwall corundum crypto-crystalline crystalline crystals cyanite damourite Dana's Mineralogy Delaware county East Bradford township Easton feldspar Ferric oxide Ferrous fibrous foliated forms frequently galenite garnet GENTH gneiss granular grayish grayish-white green greenish Haidinger hexagonal prisms hornblende incrustations iron Jour Journ Lancaster county Lebanon county lime limestone limonite localities Lustre vitreous Magnesia magnetite Manganous oxide masses massive Middletown township miles mineral mines Montgomery county Newlin township Nottingham township observed occurs octahedral orthoclase orthorhombic oxygen ratio pearly Pennsylvania petroleum Philadelphia Phoenixville planes Potash Prof quantity quartz radiating rarely rhombohedral rocks Roepper Schuylkill serpentine silicate of alumina Silicic acid Silicic acid Alumina Soda sometimes species specimens stalactitic tourmaline Unionville usually variety Water West Nottingham West Nottingham township Wheatley Wood's yellow yellowish zinc
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Seite 7 - Pa., near Pittsburgh. A farmer was ploughing in the field, where, seeing a snake, he seized a stone, as he supposed, to destroy the animal, but, finding it remarkably heavy, he was attracted, after completing his purpose, to examine the body which possessed such a remarkable weight. It was carried to Pittsburgh, where it was found to be very malleable, and unfortunately wrought into a bar, which has since been lost sight of. The mass was of an orvidal figure, almost six or seven inches in diameter,...
Seite 3 - ... millions of dollars. And if, as is pretty certain, the corporate limits of the city would afford eight times this bulk of clay, we have more gold than has yet been brought, according to the statistics, from California and Australia.
Seite 3 - Passing over the evidence respecting its presence in various galenas, in metallic lead, copper, silver, antimony, etc., we cite the following, perhaps the most curious result of all. Underneath the paved city of Philadelphia there lies a deposit of clay, whose area, by a probable estimate, would measure over three miles square, enabling us to figure out the convenient sum of ten square miles. The average depth is believed to be not less than fifteen feet. The inquiry was started whether gold was...
Seite 70 - Deshong's quarry, near Leiperville ; in the granitic veins of the same quarry and in the vicinity very beautiful slender crystals of yellowish, greenish and blueish beryl have been found ; they are sometimes ten to twelve inches in length and one and a half inches in diameter, and frequently terminated with the basal plane.
Seite 3 - This experiment was repeated upon clay taken from a brickyard in the suburbs of the city, with nearly the same result. In order to calculate with some accuracy the value of this body of •wealth, we cut out blocks of the clay, and found that on an average, a cubic foot, as it lies in the ground, weighs 120 pounds, as near as may be ; making the specific gravity 1 -92. The assay gives seven-tenths of a grain, say three cents' worth of gold to the cubic foot.
Seite 120 - H = 1.5 ; sp.gr. — 2.66-2.70. The following varieties have been analyzed by Roepper: a. pale yellowish-white; 6. ochre-yellow (after having been dried during one hour at 105°C.) ; c. Blake analyzed a pale-yellow variety: abc Silicic acid — 48.94 46.45 41.36 Alumina = 10.66 7.41 8.04 Ferric oxide — 3.85 14.28 9.55 Zinc oxide = 26.95 22.86 32.24 Magnesia = ) 0.97 1.02 Lime...
Seite 46 - I secured a considerable number of specimens from the "big hill" at . •Cornwall, and proved them to be a new mineral. Amorphous ; orange yellow to orange red ; forms very thin, sometimes raglike coatings upon magnetite ; soft. On heating loses water and becomes black ; contains water and cuprous oxide. It is impossible to obtain from the quantity which I have noticed, enough for analysis ; its composition is probably H, O, Cu, O.
Seite 16 - No actual occurrence of chalcocite is known in Lehigh County, although it may well be found in association with malachite in Flint Hill in the extreme southeastern corner of the county. "According to a private communication from Prof. "W. Th. Roepper, of Bethlehem, chalcocite, occasionally in small crystals, is frequently met with on the line of junction between the South Mountain rocks and the Triassic sandstone, which latter is often colored green by malachite, resulting from the oxidation of the...
Seite 46 - it occurs in small rhombic crystals in geodes, frequently associated with turgite in limonite beds, especially in Williams and Saucon townships, Northampton County.
Seite 165 - ... a beautiful pink or rose color, and is not unlike that of peach blossoms." (Blake, 1853.) Blake published a further description in 1858 (see bibliography), JL Smith discussed it in 1854, and Genth in 1857 and 1875. Genth gives additional data with analysis as follows : "The original specimen . . . consisted of an aggregate of small orthorhombic crystals in thin four-sided plates or minute tables, with beveled edges and a micaceous cleavage ; it shows pearly lustre, and a delicate pinkish, grayish-white...