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Updated: June 24, 2025
Calcite. In places the limestone is perfectly crystallized, and of a pure white or other color, when it forms an attractive mineral, and often worth removing. The limestone of the main quarry, carefully averaged, was found to have the following chemical composition. Lime. 11.09 Magnesia. 37.94 Carbonic acid. 30.61 Silica. 10.22 Water and loss. 4.90 Iron and alumina. 5.24 100.00
The poor gentleman, who had a vast opinion of himself and always contradicted everybody about everything, meant that his soil contained a deal of silica, and that iron pyrites was abundant in it. The importance of the annual migration from Britain is best evidenced by the representation of the chief emigrant agent at Quebec, subjoined.
The lava had burned off the bark and partly carbonized the outside part, and then the whole had subsequently taken the form of opal silica. There is a space of about four inches between the tree and the surrounding lava. "By raising the candles above our heads we could look up the body of the tree some thirty feet.
You speak of ten days or a fortnight being necessary to neutralize caustic lime, but our horses had their feet injured by it six weeks after it had been spread on the land, last year, although the weather had been wet almost the whole of the time, say from the beginning of February to the middle of March. You appear to think that lime will replace silica in the wheat plant.
And what's silica? Practically the same as sand! Well now if ye put a handful of sand into a man's brain or anyhow next door to it, it's bound to have some effect, bound to have some effect!"
We now came to blocks of silicified wood lying on the surface; it is so like recent wood, that no one who has not handled it would conceive it to be stone and not wood: the outer surface preserves the grain or woody fibre, the inner is generally silica.
Literally, they are the vents through which the steam and boiling water can escape. In doing so, however, the water, as at the Mammoth Springs, leaves a sediment of pure white lime or silica. Hence, from a distance, these basins look like desolate expanses of white sand. Beside them always flows a river which carries off the boiling water to the outer world.
It seems that a short distance from Tezcuco there is a deposit of hydrated silica, which is brought down in great blocks by the Indians; and this, when calcined, answers the purpose perfectly, as there is scarcely any iron in it. In its natural state it resembles beeswax in colour.
Is it not more rational to suppose with Richthofen that these are related as cause and effect, rather than that cold water has leached the ore and the silica from the walls near the surface? Mr.
It consists essentially of silicon, oxygen, iron; or, to speak more correctly, it is a silicate of the protoxide of iron. It is, in fact, a true igneous rock. Portions of quartz and silica still remaining unfused, are often contained in the masses, which give to them, when broken, a true porphyritic appearance, while, from the great preponderance of the protoxide of iron, it is invariably black.
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