M20
Frame ID: M20
Sample ID: Metallurgical Coke
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: (80 daylight)
Important Features: Medium ribbon anisotropic coke texture
Description: The purple and green speckled area is cell wall material and the dark areas around the margins are vesicles. In the ASTM/U.S. Steel Carbon Form Classification this sample falls into the Circular Anisotropic 12.0-25.0 µ group. This type of carbon form is typical of low volatile bituminous coals of V type 16.