Tetrahedrite replaced by hessite. Tetraedrite hessite; gangue is quartz, Durango Girl mine. La Plata County, Colorado. 1936.
Dates
Date Taken
1936
Summary
Photomicrograph of polished sections of ore: Tetrahedrite replaced by hessite. Tetraedrite hessite; gangue is quartz; reflected light enlarged 60 x. Durango Girl mine. Photo by F.W. Galbraith. La Plata County, Colorado. Circa 1936. Plate 10-B, in U.S.Geological Survey Professional paper 219. 1949.
Summary
Photomicrograph of polished sections of ore: Tetrahedrite replaced by hessite. Tetraedrite hessite; gangue is quartz; reflected light enlarged 60 x. Durango Girl mine. Photo by F.W. Galbraith. La Plata County, Colorado. Circa 1936. Plate 10-B, in U.S.Geological Survey Professional paper 219. 1949.
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