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Updated: June 5, 2025
Very many conical hills appear among them, and they are generally covered with trees. On their tops we have beautiful white quartz rocks, and some have a capping of dolomite. On the west of the second range we have great masses of kyanite or disthene, and on the flanks of the third and fourth a great deal of specular iron ore which is magnetic, and containing a very large percentage of the metal.
Principal Mineral Substances discovered in France. Dolomite in the mountains of Vosges and in the Pyrenees. Carburet of iron or plumbago, in the south peak of Bigorre. The same variety has been been found near Argentiere, and the valley of Chamouny, department of Mont-Blanc. A rock of the appearance of porphyry, with a calcareous base, in the same valley of Chamouny.
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