M21
Frame ID: M21
Sample ID: Metallurgical Coke
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Coarse ribbon anisotropic coke texture
Description: The red and yellow areas are cell wall material and the dark lenticular areas are vesicles. In the ASTM/U.S. Steel Carbon Form Classification this sample falls into the Ribbon Anisotropic +25.0 µ group. This type of carbon form is typical of low volatile bituminous coals of V types 17-19.