ОписаниеUSGS Bulletin787 Plate19 FigureB Galena and Argentite in mutual boundary structure.jpg
English: Original caption: Galena (gn) and Argentite (arg) in mutual boundary structure, the Argentite in part replaced by native silver (Ag), Last Chance Mine, 300 Level. Enlarged 250 diameters. Scale: Assuming original was 100 mm wide, the width of the image represents 0.4 mm.
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Источник
Geology and Ore Deposits of the Mogollon Mining District, New Mexico. United States Geological Survey Bulletin 787. Washington Government Printing Office, 1927.