. The prospector's field-book and guide in the search for and the easy determination of ores and other useful minerals. for silver. Test for Silver in Galena. Powder thegalena and dissolve it in strong nitric acid (fumingacid is best, which has been described), then dip apiece of polished copper strip in the solution, and, ifsilver exists in any amount, there will be formed afilm of silver on the copper. If the thin film be-(.174) LEAD AND TIN. 175 comes decidedly silvery, and in a short time, the oreshould be laid aside for a more careful analysis. The order of strata in the galena district o
. The prospector's field-book and guide in the search for and the easy determination of ores and other useful minerals. for silver. Test for Silver in Galena. Powder thegalena and dissolve it in strong nitric acid (fumingacid is best, which has been described), then dip apiece of polished copper strip in the solution, and, ifsilver exists in any amount, there will be formed afilm of silver on the copper. If the thin film be-(.174) LEAD AND TIN. 175 comes decidedly silvery, and in a short time, the oreshould be laid aside for a more careful analysis. The order of strata in the galena district of Wis-consin, Illinois and Iowa is shown in the annexedtable. NIAGARA LIMESTONE. f Galena limestone which bears lead. 1 Trenton limestone, A MRRO- «! Sandstones, shales, and calcareous beds. k Lower magnesian limestones. [ Lower limit of lead. WHITE POTSDAM SANDSTONE. Upper— Fossiliferous slates. CAMBKIAN J Lower— Dolomitic limestones. Dark sandstones. Order of Strata in the Lead District of Wisconsin, Illinois, and Iowa. The geology and form of lodes of the galena oresare seen in Fig. 52. Fig. Lead Lode in Micaceous;Slate in Mine near Middletown, Conn. 176 PROSPECTOR S FIELD-BOOK AND GUIDE. In several regions, and extensively so in Colorado,a rich carbonate of lead has been found (Fig. 53). Carbonate of Lead or Cerussite. If perfectlypure its composition is, lead , carbonic acid a mineral its hardness is 3 to , its specific Fig. 53.
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