Manual of Mineralogy and Petrography: 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 and Sons, 1894 - 517 Seiten |
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Häufige Begriffe und Wortgruppen
acid actinolite afforded albite alumina angle apatite arsenic asbestus augite B.B. fuses barite basal beryl biotite blende blue bluish brown brownish calcite carbonate cerussite chalcopyrite chlorite chrysolite cleavage coal cobalt color Composition containing copper crystalline 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 greenish hematite heulandite hexagonal hornblende hydrous infusible iron isometric lateral axes lime limestone limonite Lustre vitreous magnesia magnetite malachite manganese Mass massive metallic metamorphic mica mineral mines monoclinic muscovite nearly occurs octahedrons oligoclase orthoclase orthorhombic oxide oxygen parallel planes potash protoxide pyrite pyroxene quartz quartz crystals reddish rhombic prisms rhombohedral rocks rutile scapolite schist serpentine sesquioxide Silica silver soda sometimes species sphalerite sphene stilbite streak sulphate sulphide sulphur talc tetragonal tourmaline tremolite triclinic usually variety veins vertical axis yellow yellowish zircon
Beliebte Passagen
Seite 68 - ... immerse it, thus suspended, in a glass of distilled water (keeping the scales clear of the water) and weigh it again; subtract the...
Seite 256 - Onyx. A kind of agate having the colors arranged in flat horizontal layers ; the colors are usually light clear brown and an opaque white. When the stone consists of sard and white chalcedony in alternate layers, it is called sardonyx. Onyx is the material used for cameos, and is well fitted for this kind of miniature sculpture.
Seite 244 - Cracow, in Poland, is supposed to contain salt enough to supply the whole world for many centuries, although it has been wrought for six or seven hundred years. It has been explored to an astonishing depth ; and its subterranean regions are excavated into houses, chapels, and other ornamental forms, the roof being supported by decorated pillars of salt.
Seite 177 - Icta (the Isle of Wight), in their little wicker boats covered with leather. The import of the passage in Diodorus is, that the Britons who lived in those parts dug tin out of a rocky sort of ground, and carried it in carts at low water to certain...
Seite 68 - ... directions may be obtained with great accuracy by means of an instrument called a sclerometer. 2. TENACITY. The following rather indefinite terms are used with reference to the qualities of tenacity, malleability, and flexibility in minerals : 1. Brittle. — When a mineral breaks easily, or when parts of the mineral separate in powder on attempting to cut it. 2. Malleable. — When slices may be cut off, and these slices will flatten out under the hammer, as in native gold, silver, copper. 3.
Seite 352 - Gagates of Dioscorides and Pliny, a name derived from the river Gagas, in Syria, near the mouth of which it was found, and the origin of the term jet, now in use.
Seite 157 - ... this. amount. Still when abundant, as it appears to be in the Mississippi valley, it is a valuable ore. It is easy of reduction by means of limestone as a flux. Dioptase is another silicate of copper, occurring in rhombohedral crystals and hexagonal prisms. R: R=126° 17'.
Seite 195 - Splendid crystallizations of this ore come from Elba, whose beds were known to the Romans ; also from St. Gothard ; Arendal, Norway ; Langbanshyttan, Sweden ; Lorraine and Dauphiny. Etna and Vesuvius afford handsome specimens. In the United States, this is an abundant ore. The two iron mountains of Missouri, situated 90 miles south of St. Louis, consist mainly of this ore, piled "in masses of all sizes from a pigeon's egg to a middle size church." One of them is 150 feet high, and the other, the...
Seite 152 - Ibs. is the annual consumption of blue vitriol in the United States. In some mines the solution of sulphate of copper is so abundant as to afford considerable copper, which is obtained by immersing clean iron in it. It is called Copper of Cementation. At the copper springs of Wicklow, Ireland, about 500 tons of iron were laid at one time in the pits : in about twelve...
Seite 4 - THE attraction which produces crystals is one of the fundamental properties of matter. It is identical with the cohesion of ordinary solidification; for there are few cases outside of the kingdoms of life in which solidification takes place without some degree of crystallization. Cohesive attraction is, in fact, the organizing or structure-making principle in inorganic nature, it producing specific forms for each species of matter, as life does for each living species. A bar of cast-iron is rough...