Elementary Treatise on Mineralogy and GeologyCummings and Hilliard, 1816 - 668 oldal |
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alumine amorphous angles antimony appears argillaceous argillite arsenic barytes Basalt beds blowpipe blue BROCHANT BRONGNIART brown brownish calcareous carbonate of lime cavities Chemical characters clay Coal cobalt color compact composed conchoidal contains copper crystals earth easily edges epidote faces feldspar fibrous foliated four-sided fracture frequently friable fusible Geological sit gneiss grains granite granular grav gray gray copper grayish green greenish greenstone Haur HAUY Hence hornblende integrant particles JAMESON KIRWAN Klaproth laminæ less limestone lustre magnesia manganese masses melts metallic mica mineral muriate nearly nitric acid occurs octaedron odor opaque oxide of iron oxigen porphyry powder primitive form primitive rocks prism pyritous quartz reddish resembles rhomb salt sandstone secondary rocks shades shining silex silver slate solid angles sometimes spec species specimen structure SUBSPECIES substance sulphate sulphur sulphuret of iron surface tinge translucent truncated uneven usually variety veins WERNER yellow yellowish yielded Zeolite
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ii. oldal - BBOWN, of the said district, hath deposited in this office the title of a book, the right whereof he claims as author, in the words following, to wit : " Sertorius : or, the Roman Patriot.
40. oldal - When a ray of light passes obliquely from one medium to another of different density, it is refracted or bent out of its course.
586. oldal - This observation holds good to the present day. His remarks on the position of the beds of rocks were no less interesting: When primitive rocks are stratified the strata are seldom horizontal. On the contrary, they are often highly inclined and sometimes nearly or quite vertical. But whether these strata were originally inclined or whether, subsequent to their formation, they have been changed from a horizontal to an inclined position by the action of some powerful cause, is a question on which the...
495. oldal - The heliotrope has formed among it in centres, to which the chalcedony seems to have been drawn, as if by molecular attraction. We find a mass, varying from the size of a walnut to that of a man's head, occupying some larger vesicle or crevice of the amygdaloid, and all the smaller vesicles around it, for an inch or two, filled with what we may venture to term satellite heliotropes, some of them as minute as grains of wild mustard, and all of them more or less earthy, generally in proportion to their...
176. oldal - ... of the earths which it contains ; and whether a calcareous or an argillaceous marl will be more suitable to a given soil, may be determined with much probability by its tenacity or looseness, moisture or dryness. To employ marls judiciously, therefore, the farmer should be in some degree arquainted with the chemical properties or constituent parts of the marl itself, and with the ingredients of the soil.
176. oldal - Marl, like clay, belongs both to secondary and alluvial earths, where it occurs in masses or in beds. Hence it is found associated with compact limestone, chalk, gypsum, or with sand or clay. It contains various organic remains, as shells, fish, bones of birds and of quadrupeds, and sometimes vegetables.
533. oldal - ... than the calamine. Sheet zinc is becoming an article of considerable demand in the market, for culinary purposes, and as a covering for valuable buildings, instead of lead. But the chief consumption of this metal is in making brass, well known to be a compound of copper and zinc. In this process, the carbonate of zinc, previously calcined, is mixed with charcoal and granulated copper, and then exposed to a suitable heat. The common brass imported from England contains upwards of thirteen per...
623. oldal - All true conglomerates must of course be composed of fragments of previously existing rocks. They have, however, been formed at very different periods. A breccia is an aggregate of angular fragments of the same mineral, or of different minerals, united by some cement. Sometimes, however, a few of the fragments are a little rounded. SANDWICH ISLANDS ; a cluster of islands in the North Pacific ocean, discovered by captains Cook and King in 1778, who gave them their present name in honor of the first...
331. oldal - At first small gray specks or elevated gray spots (glanders-nodules), varying in size from that of a pin's head to that of a pea, make their appearance (Fig.
176. oldal - ... tenacity or looseness, moisture or dryness. To employ marls judiciously, therefore, the farmer should be in some degree acquainted with the chemical properties or constituent parts of the marl itself, and with the ingredients of the soil. He may, in general, determine the existence of marl by its falling into powder, when dried, after exposure to moist air. To ascertain the proportion of its ingredients, the calcareous part may be extracted from a given weight of the marl, by solution in acids,...