Coal Macerals MA36 | Petrographic Altas | SIU

Southern Illinois University



Crelling's Petrographic Atlas of Coals and Carbons

College of Science


Frame ID: MA36
Sample ID: Elkhorn #3 seam Appalachian high volatile A bituminous coal, eastern Kentucky
Maceral Group: Inertinite
Maceral Type: Secretinite
Magnification: As given
Illuminator: Vertical
Objective: 50x oil
Polarizer: In
Analyzer: Out
Retarder Plate: Out
Filter: None
Important Features: The bright round particles are secretinite macerals.
High Resolution Image (300 dpi)

Description: The two bright particles of secretinite (previously called resino-sclerotinite) show the high reflectance and lack of cell structure typical of these macerals. Similar macerals with a reflectance in the semifusinite range are called semi-macrinite.