Manual of Mineralogy ...Durrie & Peck, 1855 - 432 páginas |
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Términos y frases comunes
affords alumina angles antimony arsenic bismuth blende blowpipe blue borax brittle brown calc spar called carbonate cent charcoal chlorid clay cleavage coal cobalt color Composition Conn consist containing copper pyrites Cornwall crystals dark distinguished earthy feldspar fibrous flame fluor foliated fumes furnace fuses fusible galena gangue garnet glass globule gneiss gold granite granular gray green heated hornblende Infusible iron pyrites lead lime limestone luster Luster vitreous magnesia magnetic iron manganese masses massive mercury metal mica mineral mines native nearly nickel nitric acid obtained occurs octahedrons odor opaque oxyd oxyd of copper oxyd of iron potash pounds Prim prisms protoxyd of iron pyroxene quartz resembles rhombic prisms rhombohedron rocks salt Saxony scapolite serpentine silica silver slate soda sometimes species specific gravity streak strl sulphate sulphuret sulphuric acid talc tourmaline translucent transparent usually variety veins yellow zinc
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Página 430 - Is traversed lengthwise by two parallel ranges of mountains — the Sierra Nevada on the east and the coast range on the west — which...
Página 49 - I.) ; hence the sum of all the angles, both interior and exterior, is equal to twice as many right angles as there are sides to the polygon. But the sum of the interior angles alone, less four right angles, is equal to the same sum (Prop.
Página 385 - Cologne, (Hamburgh, etc.,) = 8 oz. = 3608 Eng. grs. The Russian pood (or pud) = 40 Russian pounds = 36 English pounds avoirdupois. 12 inches English, 1 foot. 3 feet, 1 yard. 40 rods, 1 furlong. 8 furlongs, 1 mile. 3 miles, 1 league.
Página 317 - ... reduced to a manageable quantity, the gold is amalgamated with clean mercury ; the amalgam is next strained to separate any excess of mercury, and finally is heated and the mercury expelled, leaving the gold.
Página 86 - It receives a brilliant polish, and is set in jewelry. It is the 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.
Página 22 - The sizes of the faces vary, and also the number of faces, according to certain simple laws hereafter to be explained ; but the corresponding angles of inclination are essentially the same, whatever the variations or distortions. Other minerals have a like constancy in their crystals, and each has some peculiarity, some difference of angle, or some difference of cleavage structure, which distinguishes it from every other mineral. In many cases, therefore, we have only to measure an angle to determine...
Página 81 - United States, the diamond has been met with, in Rutherford county, North Carolina, (fig. 4,) and Hall county, Georgia. The original rock in 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 it is also abundant in Georgia and North Carolina. In India, the rock is a quartzobe conglomerate.