School of Geosciences and Surveying Engineering;
China University of Mining and Technology(Beijing);
Beijing 100083;
China;
State Key Laboratory of Lithospheric Evolution;
Institute of Geology and Geophysics;
Chinese Academy of Sciences;
Beijing 100029;
China;
The EMS Energy Institute;
and the Leone Family Department of Energy and Mineral Engineering;
Pennsylvania State University;
University Park PA 16802;
USA;
micro-Raman spectroscopy; structural ordering evolution; coal-derived natural graphite; XRD; anthracite;