ОписаниеUSGS Bulletin787 Plate17 FigureA Ore from Silver Bar Tunnel.jpg
English: Original caption: Ore from Silver Bar Tunnel. Showing graphic intergrowth of bornite (black) and chalcocite (white). 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.