FA74

Frame ID: FA74
Sample ID: 92176 (slide 290-27)
Magnification: 330 microns on long side
Illuminator: Vertical
Objective: 32x oil
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter:
Important Features: Spinel

Description: Spinel in glass with included mullite. Bottom ash from power plant burning high-sulfur, high volatile C Illinois Basin coal.