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acid alumina American Institute analyses apatite arsenic asbestos associated bauxite beds brine Bulletin calcite calcium Canada carbonate cement cent chemical chloride clay cobalt color composition Constituents containing corundum country rock County crystalline crystals deposits depth diameter Diamond dikes dolomite emery Engineering and Mining feet in thickness feldspar fibrous garnets Geol gneiss granite granular graphite gray gypsum hardness impurities inches Institute of Mining kaolin Lake lime limestone localities magnesia magnetite mainly manganese manufacture masses massive material metallic mica miles mineral occurs Mining Engineers Mining Journal nodules North Carolina ocher origin pegmatite peridotite phosphate pisolites Plate pyrite pyrolusite pyroxene quantities Quarry quartz region reported rock salt sand sandstone schist serpentine shales silica soda soluble sometimes South specific gravity stone sulphate sulphide sulphur surface syenite tons Trace U. S. Geological Survey U. S. National Museum Uses.—The variety varying veins Virginia width yield York
Page 250 - HUTCHINGS. Notes on the Composition of Clays, Slates, etc., and on some Points in their Contact-Metamorphism.
Page 26 - It is remarkable that in these mines nickel ores do not accompany the ores of cobalt in any appreciable quantity. The principal fahlband is known to extend for a distance of about six miles, and is bounded on the east by a mass of diorite which protrudes into the fahlband, while extending from the diorite are small dikes or branches traversing it in a zig-zag course. It is also intersected by dikes of coarse-grained granite which contain no ore, but which penetrate the diorite...
Page 250 - REPORT ON THE CLAY DEPOSITS of Woodbridge, South Amboy and other places in New Jersey, together with their uses for firebrick, pottery, &c.
Page 94 - ... reddish brown clay, which contains also similar masses of basaltic iron ore and fragments of more or less weathered basalt itself. Although the latter was associated intimately with the bauxite, a direct and close connection of the two could not be found, but an examination of thin sections of the Vogelsberg bauxite showed that most specimens still possessed a basaltic (anamesite) structure, which enabled the author to determine the former constituents with more or less certainty. The...
Page 94 - ... by erosion, and are high enough above the drainage of the country to be readily quarried. Erosive action has removed a part of the bauxite in some cases, but there are in all probability many places at which it has not yet been even uncovered. It is pisolitic in structure, and, like all bauxite, varies more or less in color and in chemical composition. At a few places it is so charged with iron, that attempts have been made to mine it for iron ore. Some of the samples from these pits assay over...
Page 221 - Minerals, p. 217. may be described, "as a whole, as heterogeneous aggregates of hydrous and anhydrous aluminous silicates, free silica, and evervarying quantities of free iron oxides and calcium and magnesian carbonates, all in finely comminuted condition.
Page 184 - Owing to careless usage, and in part to ignorance, the name asbestos1 is now applied to at least four distinct minerals, having in common only a fibrous structure and more or less fire and acid proof properties.
Page 370 - ... 1 . Petroleum is derived from organic matter. 2. Petroleum of the Pennsylvania type is derived from the organic matter of bituminous shales, and is probably of vegetable origin. 3. Petroleum of the Canada type is derived from limestones, and is probably of animal origin. 4. Petroleum has been produced at normal rock temperatures (in American fields), and is not a product of destructive distillation of bituminous shales. 5. The stock of petroleum in the rocks is already practically complete.
Page 101 - But calcium carbonate reacts upon aluminum sulphate and to some extent also on alum, forming a gelatinous or flocculent precipitate which consists of aluminum hydroxide and the basic sulphate. This reaction may have taken place at great depth and the resulting flocculent precipitate may have been brought to the surface in suspension. From analogy with pisolitic sinter and travertine now forming, such conditions would appear to be highly favorable for the production of the structures actually found...
Page 106 - The contact between the ocher and inclosing quartzite is never sharp and distinct, but always shows a more or less gradual transition from the hard vitreous quartzite, to the soft ore which may be easily crushed between the fingers. The quartzite first becomes stained a light yellow, and loses its compact, close-grained texture. This phase passes into a second, in which the rock is perceptibly porous, having a rough fracture and a harsh "feel", and containing enough ocher to soil the fingers. In...