P40
![p40](../_common/images/q1-40/p1-40/p40atlas.jpg)
Frame ID: P40
Sample ID: Petroleum (Fluid) Coke
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: In
Retarder Plate: In
Filter: None
Important Features: Fluid coke particles
Description: Fluid coke particle formed in the fluid coker showing concentric structure and spoke-like extinction patterns.