Photographs of Permian coal samples collected from the Yongan Coalfield, South China. (IMAGE)

Science China Press

Photographs of Permian coal samples collected from the Yongan Coalfield, South China.

Caption

(a) Tectonically deformed coal with large-scale irregular friction mirror planes for sample XGZ; (b) fractures and friction mirror planes in sample QK; (c) well-developed friction mirror planes in sample TX10; (d) loose small coal particles in sample TX11; (e) scratches in sample TX23; (f) small-scale friction mirror planes in sample TX26; (g) hydrothermal quartz veins in sample TX35; (h) friction mirror planes in sample TX43.

Credit

©Science China Press

Usage Restrictions

Use with credit.

License

Original content

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.