Filters: Tags: {"type":" category"} (X) > partyWithName: Boutwell, John Mason (X)

Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts U.S. Geological Survey Categories Image (1) Tags (with Type= category ) photographers (1) View Results as: JSON ATOM CSV

Photomicrograph of fresh and decomposed mineralized monzonite, development of pyrite in altered monzonite, from Eldorado shaft, Boston Consolidated group. Salt Lake County, Utah. 1900. Photomicrograph of fresh and decomposed mineralized monzonite, development of pyrite in altered monzonite, from Eldorado shaft, Boston Consolidated group. Magnetite and original biotite are absent, pyrite appears embedded in secondary quartz associated with flocculent aggregates of biotite, probably secondary. Feldspathic constituents have gone over to sercicite. Salt Lake County, Utah. 1900, plate 26-B in U.S. Geological Survey. Professional paper 38. 1905. Categories: Image; Tags: Boutwell, J.M. Collection, Photographers, Photomicrographs, photo print