File:USGS Bulletin787 Plate18 FigureB Mutual boundary between Stromeyerite and Galena.jpg

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Mutual boundary between Stromeyerite (str) and Galena (gn), with Chalcopyrite (cp) and sphalerite (sl)

Description	English: Original caption: Mutual boundary between Stromeyerite (str) and Galena (gn), Last Chance Mine, 300 Level. cp, Chalcopyrite, sl, sphalerite. Enlarged 250 diameters. Scale: Assuming original was 100 mm wide, the width of the image represents 0.4 mm.
Date	1927
Source	Geology and Ore Deposits of the Mogollon Mining District, New Mexico. United States Geological Survey Bulletin 787. Washington Government Printing Office, 1927.
Author	Henry G. Ferguson

	This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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