Coal Macerals MA40 | Petrographic Atlas | SIU

Southern Illinois University



Crelling's Petrographic Atlas of Coals and Carbons

College of Science


Frame ID: MA40
Sample ID: Elkhorn #3 seam Appalachian high volatile A bituminous coal, eastern Kentucky
Maceral Group: Inertinite
Maceral Type: Micrinite
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: The fine-grained material is micrinite.
High Resolution Image (300 dpi)

Description: The fine grained material is micrinite. It is characterized by its high reflectance and very fine size. In this example, the forms outlined by the fine particles are similar to sporinite and the micrinite may be derived from altered sporinite.