Coal Macerals MA20 | Petrographic Atlas | SIU

Southern Illinois University



Crelling's Petrographic Atlas of Coals and Carbons

College of Science


Frame ID:  MA20
Sample ID:  Elkhorn #3 seam Appalachian high volatile A bituminous coal, eastern Kentucky
Maceral Group: Liptinite
Maceral Type: Sporinite
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: A dark sporinite maceral in the center of the field.
High Resolution Image (300 dpi)

Description: The dark folded structure in the center of the field is a typical megaspore. It shows the characteristic flattened-sphere structure resulting in a bilateral symmetry around a central fissure. The much smaller dark bodies are microspores with less developed symmetry.