FA71

Frame ID: FA71
Sample ID: slide 284-33
Magnification: 330 microns on long side
Illuminator: Vertical
Objective: 32x oil
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter:
Important Features: Spinel

Description: Spinel. Three spinel-rich spheres showing contrasting textures. Interstitial space within spinel-rich spheres is generally glass. From power plant burning low- to medium-sulfur, high volatile bituminous Central Appalachian coal.