M02
Frame ID: M02
Sample ID: Metallurgical Coke
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: Blue (80 daylight)
Important Features: Isotropic coke texture
Description: The purple isotropic area is coke cell wall material and the dark lenticular features are mineral matter. In the ASTM/U.S. Steel Carbon Form Classification this sample falls into the Isotropic O µ group. This type of carbon form is typical of high volatile bituminous coals of V type 7 or lower.