FA91
Frame ID: FA 91
Sample ID: 92591 (slide 397-20)
Magnification: 200 microns on long side
Illuminator: Vertical
Objective: 50x oil
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter:
Important Features: Spinel
Spinel spheres flanking highly-reflecting metal shard. Fly ash from power plant burning low-sulfur, high volatile B bituminous western US coal.