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Metals are not generally found in the ground in a pure state. For the most part they are combined with oxygen or sulphur. Such was the case with the two specimens which Cyrus Harding had brought back, one of magnetic iron, not carbonated, the other a pyrite, also called sulphuret of iron.
In shells originally made of ARAGONITE, a crystalline form of carbonate of lime, that mineral is usually replaced by CALCITE, a more stable form of the same substance. The most common petrifying materials are calcite, silica, and pyrite. Often the organic substance has neither been preserved nor replaced, but the FORM has been retained by means of molds and casts.
The ore yields a very soft and pure lead, though the presence of pyrite prevents the manufacture of the virgin lead used in making the best brands of white paint. The French government has placed on the top of the Puy de Dome a meteorological observatory, which, as that is the highest land in France, answers to our stations on Mt. Washington and Pike's Peak.
"Ye air the deceivinest sandy-headed Pyrite that ever war on the top o' this mounting, an' ye knows it," Birt retorted in high good humor; "an' ef it war wuth my while I'd gin ye a old-fashion larrupin' jes' ter pay ye fur the trick ez ye played on me. But I ain't keerin' fur that, now. Stan' back thar, Tennessee!"
D'autres de pierre calcaire compacte et d'une épaisseur considérable. Alternativement de moins compactes. Dans l'une de ces couches il y a de la pyrite vitriolique décomposé, qui teint en jaune les parties du rochers sur lesquels a flué la décomposition martiale. Quelques filons de spath jaunâtre, entremêlés de veines de schiste pur, ne faisant pas effervescence. De la pierre calcaire.
The mule lived to a great age, always with his master as "mild-mannered" as a lamb. For some time Birt saw nothing of Nate, but one day the quondam friends met face to face on a narrow, precipitous path on the mountain side. Abject fear was expressed in Nate's sharp features, for escape was impossible. There was no need of either fear or flight. "How air ye, I'on Pyrite!" cried Birt cheerfully.
The ore was kept in a place having a temperature little less than boiling water for six weeks, when all the gold, except one ounce per ton, was found to have gone into solution. A few small crystals of pyrite were then placed in the bottle of solution, and the gold began immediately to precipitate on them.
The repast at length terminated; at the moment when each one was about to give himself up to sleep, Cyrus Harding drew from his pocket little specimens of different sorts of minerals, and just said, "My friends, this is iron mineral, this a pyrite, this is clay, this is lime, and this is coal. Nature gives us these things. It is our business to make a right use of them.
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