Metallurgical Coke M28 | Petrographics Atlas | SIU

Southern Illinois University



Crelling's Petrographic Atlas of Coals and Carbons

College of Science



Frame ID: M28

Sample ID: Metallurgical Coke

Magnification: As given

Illuminator: Vertical

Objective: 50x oil

Polarizer: In

Analyzer: In

Retarder Plate: In

Filter: None

Important Features: Dull coal/bright coal interface

High Res image (300 dpi)

Description: The particle on the right, derived from bright coal, shows well developed mosaic texture and vesicles. The particle on the left, derived from dull coal, features abundant organic inerts, poorly developed vesicles, and original bedding. These features suggest that it never became as fluid as the bright coal particle. The sharp boundary between these particles is also a zone of structural weakness.