Coal Macerals MA12 | Petrographic Atlas | SIU

Southern Illinois University



Crelling's Petrographic Atlas of Coals and Carbons

College of Science


Frame ID: MA12
Sample ID: Herrin No. 6 seam, high volatile C bituminous coal, Illinois Basin, Southern Illinois
Maceral Group: Liptinite
Maceral Type: Resinite
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: Large, low reflectance resinite ovoid in blue light illumination
High Resolution Image (300 dpi)

Description: Same field of view of view as MA11 but under blue-light illumination. The yellow fluorescence of the resinite is light excited from the resinite. The presence of a dark rim around the outer surface of the maceral is a common feature and usually interpreted as a reaction rim caused by weathering.