Catalogue of Minerals, with Their Formulae and Crystalline Systems: Prepared for the Use of the Students of the School of Mines, of Columbia College

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S. Angell, Printer, 1871 - Minerals - 41 pages
 

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Page xv - Crystallized variety. Not easily scratched by the nail. Does not scratch a copper coin. 3. — Calcite. Transparent variety. Scratches and is scratched by a copper coin. 4. — Fluor.
Page 108 - Lustre vitreous; sometimes pearly on the basal planes, and occasionally exhibiting a bright opalescent star of six rays in the direction of the axis. Color blue, red, yellow, brown, gray, and nearly white ; streak uncolored.
Page 22 - ... of the oxygen of the base to the oxygen of the acid, was as 1 to 5, the ratio of the oxygen of the base to the oxygen of the water was 1 to. 2. In 1827 Mr. Graham's fellow-townsman, and predecessor at the Mechanics
Page 112 - Heated in an open tube, it gives up HF1. Soluble in sulphuric acid, giving off HF1. It is easily fusible, even in the flame of a candle, without the aid of the blowpipe. If it is then thrown into water, there seems to be a commencement of decomposition, for an alkaline carbonate or lime-water throws down...
Page 20 - Carbonates of lime and magnesia (by loss) 78.29 100.00 The substance of which the analsysis was given above, when dry, has nearly the color and appearance of Scotch snuff. Examined with the microscope, it is found to be made up of minute crystals of dolomite, thickly coated with pulverulent oxide of iron, of which the analysis shows an amount present equal to fifteen percent. Here there would seem to be no doubt that the disintegration of the opening material was caused by the oxidation of the sulphuret...
Page 123 - Marcasite takes the forms of organisms either by filling or by substituting molecule for molecule. It decomposes very easily in the air, and forms sulphate of iron. In order to preserve it in collections, it must generally be coated with varnish. Sometimes, though rarely, the product of decomposition is Hepatic Pyrites, as is the case with the balls that occur in the Chalk. A variety is sometimes found which does not decompose.
Page 170 - Chrysocolla, but arc distinguished by effervescing with acids. It is a valuable ore of copper, when found in large quantities. It is much used for articles of ornament, and is often employed for veneering large articles, such as tables, doors, &c. A mass weighing 40 tons, was found in Siberia. It has been found in small quantities, in most of the copper mines of the US In Cornwall, Pa., it is sometimes found in quite thick pieces of a light green color.
Page 101 - Calcite , may form pseudomorphs, which when they replace organisms are commonly called petrifactions or fossils. These pseudomorphs are not formed after the manner of silica, as the carbonate of lime does not take the structure of the organisms, but is only a mould of the interior, and sometimes only of incrustations on the outside. Under the name of marble, several varieties of Calcite are included, which are .sought after in the arts, just as we have distinguished Jasper as Quartz under certain...
Page 136 - CL, it gives As, and fuses to a globule. In a tube, it gives an arsenic mirror. With the fluxes, it affords the reactions for Co, Fe. and Ni. It is not attacked by the non-oxidizing acids. The slightly crystalline masses usually have a reticulated structure. It is also found in amorphous masses of a steel-gray color. It is sometimes covered with a green coating, which results from the nickel that it contains. It is also found in masses, which have a semi-granular or semi-lamellar fracture. There...
Page 174 - It is often found in cubes, octahedra, tetragonal trisoctahedra and hexoctahedra alone, but usually combined one with the other. The crystals are sometimes very distinct and are often grouped. It is also found in wiry filaments. It has indications of a dodecahedral cleavage, which are not very distinct. Fracture, conchoidal or uneven. Lustre, metallic. Opaque. Color, deep iron-black with very little lustre on the natural faces. The lustre is however bright on the fracture. Streak, same as color and...

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