M04
Frame ID: M04
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: Incipient coke texture
Description: The purple and green speckled area is cell wall material and the dark circular areas at the top left are vesicles. In the ASTM/U.S. Steel Carbon Form Classification this sample falls into the Incipient 0- 0.5 µ group. This type of carbon form is typical of high volatile bituminous coals of V type 8.