Frame ID: P08 Sample ID: Petroleum (Delayed) Coke Magnification: As given Illuminator: Vertical Objective: 50x oil Polarizer: In Analyzer: In Retarder Plate: In Filter: None Important Features: Coarse mesophase coke High Resolution Image (300 dpi) Description: Coke derived from a petroleum feedstock that is transitional into a mesophase mixed-layer type structure.