Frame ID: FA 57
Sample ID: 92537 (slide 378-21)
Magnification: 270 microns on long side
Objective: 50x oil
Retarder Plate: Out
Important Features: Glassy edge of particle
Vitrified outer boundary of particle. The interior has been thermally altered, note high reflectance carbons. From Kentucky power plant burning medium-sulfur, high volatile A bituminous Eastern Kentucky coal.