FA61

Frame ID: FA61
Sample ID: slide 407-20
Magnification: 200 microns on long side
Illuminator: Vertical
Objective: 50x oil
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter:
Important Features: Glass with included crystals

Description: Glass with unidentified crystals, possibly mullite, from power plant burning Powder River Basin low-sulfur subbituminous coal.