FA77
Frame ID: FA 77
Sample ID: 92054 (slide 316-7)
Magnification: 330 microns on long side
Illuminator: Vertical
Objective: 32x oil
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter:
Important Features: Spinel
Coarse spinel with finer spinel dendrites in glass. Bottom ash from power plant burning high-sulfur, high volatile C Illinois Basin coal.