Manual of Mineralogy and Lithology, Containing the Elements of the Science of Minerals and Rocks: For the Use of the Practical Mineralogist and Geologist, and for Instruction in Schools and CollegesJ. Wiley & Sons, 1878 - 474 Seiten |
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Häufige Begriffe und Wortgruppen
acid actinolite afforded albite alumina angle antimony apatite arsenic axes axis B.B. fuses barite beds beryl blende blowpipe blue borax Brittle brown calcite calcium carbonate cent chalcopyrite chlorite cleavage coal cobalt color Composition containing copper County crystalline crystals cube cyanite Diff epidote feldspar fibrous flame fluorite forms fumes fuses easily fusible galenite garnet glass globule gneiss gold granite granular graphite gray grayish green heated hematite heulandite hexagonal hornblende hydrous infusible iron isometric lime limestone limonite lustre magnesia magnesium magnetic magnetite malachite manganese Mass massive metallic metamorphic mica mineral mines monoclinic native nearly nickel occurs octahedrons opaque orthoclase oxide oxygen planes potash protoxide pyrite pyroxene quartz rhombic prisms rhombohedral rocks rutile salt scapolite schist serpentine sesquioxide silica silver soda sometimes spar species sphene stilbite streak sulphate sulphide sulphur talc tourmaline translucent transparent tremolite Trimetric tube usually variety vertical vitreous yellow zinc zircon
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Seite 102 - Brazil appears to be either a kind of laminated granular quartz called itacolumite ; or a ferruginous quartzose conglomerate. The itacolumite occurs in the Urals, and diamonds have been found in it ; and i(t is also abundant in Georgia and North Carolina. In India, the rock is a quartzose conglomerate.
Seite 474 - A TEXT BOOK OF MINERALOGY. With an Extended Treatise on Crystallography and Physical Mineralogy. By ES Dana, on the Plan and with the Co-operation of Professor JD Dana.
Seite 108 - Mexico gave the specific gravity 15 - 516'8, and contained 34 to 43 per cent, of rhodium. A bismuth gold has been called Maldonite. Diff. Iron and copper pyrites are often mistaken for gold by those inexperienced in ores; but these are brittle minerals, while gold may be cut in slices, and flattens under a hammer. Pyrite is too hard to yield at all to a knife, and copper pyrites (chalcopyrite) affords a dull greenish powder. Moreover pyrite gives off sulphur when strongly heated, while gold melts...
Seite 474 - MANUAL OF MINERALOGY AND LITHOLOGY ; Containing the Elements of the Science of Minerals and Rocks, for the Use of the Practical Mineralogist and Geologist, and for Instruction in Schools and Colleges.
Seite 381 - BB green flame due to boron, see page 99; coal is used for charcoal; fus. for fusible; infus. for infusible; sol. for soluble; st. for streak. In using the blowpipe it is important to remember that a trial of fusibility with the forceps, if not at once producing fusion, should be made on a piece of the mineral not larger than the fourth of an ordinary pin-head, and it should be either oblong and slender, or thin, and be made to project considerably beyond the points of the forceps, lest the forceps...
Seite 135 - ... copper reactions. Obs. Occurs with other copper ores in the Bannat, Thuringia, Cornwall, at Chessy near Lyons, in Siberia, and Brazil. The octahedrons are often green, from a coating of malachite. In the U.
Seite 91 - In the former sense, g;ilena, the common ore of lead, is, if it contains a little silver, an argentiferous leadore ; while, in the latter, if there is silver enough to make its extraction profitable, it is a silver-ore. Further than this, where a native metal, or other valuable metallic mineral, is distributed intimately through the gangue, the mineral and gangue together are often called the ore of the metal it produces. We have beyond to do with ores only in the mineralogical sense.
Seite 326 - Peat is vegetation which has undergone, in part, the change to coal, and, in some cases, it has become brown coal. The conditions of change are somewhat different from those of the beds of good coal, since in the case of peat the air has access, while in that of the coal the air was more or less excluded by overlying strata, and the more perfect the exclusion, other things equal, the better the coal.
Seite 102 - ... origin. Diamonds with few exceptions are obtained from alluvial washings. In Brazil, the sands and pebbles of the diamond rivers and brooks (the waters of which are drawn off in the dry season to allow of the work) are collected and washed under a shed, by a stream of water passing through a succession of boxes. A negro washer stands by each box, and inspectors are stationed at intervals. When a diamond is found weighing 17^ carats, the negro is entitled to his liberty.