File:U S Geological Survey Circular 1143 Lignite Structure.png

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Captions

Captions

Partial molecular structure of a lignin-derived organic molecule in lignite

Summary

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Description
English: From the original source: "Diagram showing hypothetical structure of a lignin-derived organic molecule in a brown coal (lignite). This structure is based on studies using carbon-13 nuclear-magnetic-resonance(13C NMR) spectroscopy and other organic-geochemical methods such as those described in table 2. Lignin is one of the constituents of woody tissue found in all vascular plants, such as trees and shrubs (W.H. Orem, U.S. Geological Survey, written commun.,1997). Studying organic matter helps provide information about the plant sources of coal and, subsequently, coal quality. See fig-ure 9 for chemical elements."

Stanley P. Schweinfurth (2002). "Coal -- A Complex Natural Resource", U.S. Geological Survey

https://pubs.usgs.gov/circ/c1143/c1143.pdf
Date
Source https://pubs.usgs.gov/circ/c1143/c1143.pdf
Author W.H. Orem, U.S. Geological Survey

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Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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