Coal Macerals MA25 | Petrographic Atlas | SIU

Southern Illinois University



Crelling's Petrographic Atlas of Coals and Carbons

College of Science


Frame ID: MA25
Sample ID: Unnamed Seam, high volatile B bituminous coal, Colorado
Maceral Group: Liptinite
Maceral Type: Sporinite
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: Out
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: The sporinite macerals fluoresce a bright yellow under blue-light illumination.
High Resolution Image (300 dpi)

Description: Same field of view as MA24 under blue-light illumination. Note how the yellow fluorescing sporinite stands out. Thus, when petrographic analysis is done in blue light, the liptinite counts are always higher than in normal white-light analysis.