. Bulletin of the scientific laboratories of Denison University. Art. IX.] Watson, Manganese Ore-Deposits of Georgia. 185 are composed of numerous complex manganese-bearing silicates. It was from these older crystalline rocks, during decay, that the manganese is believed to have been originally derived. 2. Solution, Transportation and Precipitation of the Man- ganese.—Assuming that the original source of the manganese Fk;. Section through the Westbrook Tract, Paulding Co., Georgia, Showing the Mode of Occurrence of the Ores. A, mica-schist, partially decayed, highly schistose ; B, banded
. Bulletin of the scientific laboratories of Denison University. Art. IX.] Watson, Manganese Ore-Deposits of Georgia. 185 are composed of numerous complex manganese-bearing silicates. It was from these older crystalline rocks, during decay, that the manganese is believed to have been originally derived. 2. Solution, Transportation and Precipitation of the Man- ganese.—Assuming that the original source of the manganese Fk;. Section through the Westbrook Tract, Paulding Co., Georgia, Showing the Mode of Occurrence of the Ores. A, mica-schist, partially decayed, highly schistose ; B, banded quartzite, 30 ft. wide, cut by quartz-stringers containing the ore, which includes man- ganese, manganiferous iron-ore and magnetite. was from the older crystalline rocks to the east and south, it remains to show how the manganiferous material reached its present form and position. The crystalline rocks of Georgia are composed chiefly of granites, gneisses, schists and basic igneous masses, and they are everywhere deeply decayed,—buried under a thick covering of their residual clays. The essential minerals in these rocks are silicates, many of which are manganese-bearing. Decay in this southern region has been promoted largely by chemical changes in the mineral constituents of the rocks, resulting in mineralogical combinations of simpler and more stable form, totally different from the original forms. The combined action of atmospheric oxygen, water, carbonic and organic acids, and to a less degree, perhaps, certain inorganic acids, has been the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Denison University; Denison Scientific Association. Granville, Ohio : [The University]
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