FA75

Frame ID: FA75
Sample ID: 92135 (slide 285-18)
Magnification: 330 microns on long side
Illuminator: Vertical
Objective: 32x oil
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter:
Important Features: Spinel

Description: Two spinel-rich spheres showing contrasts in crystal textures. Fly ash from power plant burning high-sulfur, high volatile C Illinois Basin coal.