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Paul Hackley
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Sharon Swanson
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Photomicrograph Atlas
Semifusinite in Metallurgical Bituminous Coals
Semifusinite: An inertinite maceral with morphology like fusinite sometimes with less distinct evidence of cellular structure, but with reflectance ranging from slightly greater than that of associated vitrinite to some value intermediate to that of the brightest fusinite. The particle size is also greater than 50 um except when it occurs as a fragment within the binder matrix (ASTM 2008).
Representative examples of macerals are labeled on each photomicrograph. Click on the thumbnail images for a larger and more detailed view. Use the "back" button on your browser to return to the Atlas:
Photomicrograph of low volatile bituminous coal from West Virginia with a mean maximum reflectance of 1.67%. Macerals shown include semifusinite, micrinite, vitrinite, and fusinite. |
Photomicrograph of low volatile bituminous coal from West Virginia with a mean maximum reflectance of 1.67%. Macerals shown include semifusinite and inertodetrinite. |
Photomicrograph of high volatile A bituminous coal from West Virginia with a mean maximum reflectance of 0.97%. Macerals shown include semifusinite, vitrinite, and inertodetrinite. |
| Photomicrograph of high volatile A bituminous coal from West Virginia with a mean maximum reflectance of 0.97%. Macerals shown include semifusinite, micrinite, vitrinite, fusinite, and inertodetrinite. |
Photomicrograph of high volatile A bituminous coal from West Virginia with a mean maximum reflectance of 0.97%. Macerals shown include semifusinite, micrinite, vitrinite, sporinite, fusinite, and inertodetrinite. |
Photomicrograph of high volatile A bituminous coal from West Virginia with a mean maximum reflectance of 0.97%. Macerals shown include semifusinite, micrinite, vitrinite, sporinite, and fusinite. |
| Photomicrograph of borderline high volatile A – medium volatile bituminous coal from West Virginia with a mean maximum reflectance of 1.15%. Macerals shown include semifusinite and fusinite. |
Photomicrograph of high volatile A bituminous coal from West Virginia with a mean maximum reflectance of 0.97%. Macerals shown include semifusinite, vitrinite, and sporinite. |
Photomicrograph of high volatile A bituminous coal from West Virginia with a mean maximum reflectance of 0.97%. The inertinite maceral shown is semifusinite. |
| Photomicrograph of high volatile A bituminous coal from West Virginia with a mean maximum reflectance of 0.97%. Macerals shown include semifusinite, vitrinite, sporinite, and inertodetrinite. |
Photomicrograph of high volatile A bituminous coal from West Virginia with a mean maximum reflectance of 1.04%. Macerals shown include semifusinite, micrinite, vitrinite, and sporinite. |
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Return to Photomicrograph Atlas index
Reference
American Society for Testing and Materials (ASTM), 2008, D 2799-05a Standard Test Method for Microscopical Determination of the Maceral Composition of Coal: Annual Book of ASTM Standards, Petroleum Products, Lubricants, and Fossil Fuels, v.05.06, Gaseous Fuels; Coal and Coke, [p 349-352].
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 RECENT PUBLICATIONS
Thermal maturity and organic composition of Pennsylvanian coals and carbonaceous shales, north-central Texas: implications for coalbed gas potential, (2009): International Journal of Coal Geology
Outside Publication - Request copy, email author.
RELATED LINKS
ASTM Subcommittee D05.28 on Petrographic Analysis of Coal and Coke:
Non-USGS Website
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U.S. Department of the Interior |
U.S. Geological Survey
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