Dull coal
This article examines the topic of dull coal — a descriptive classification of coal distinguished by its matte appearance, particular physical and chemical characteristics, and specific industrial uses. Dull coal…
Bright coal
Bright coal — often used in industry and geology to describe high-luster, high-rank coals such as anthracite and high-grade bituminous coals — occupies a distinctive place in the global energy…
Vitrain coal
Vitrain coal occupies a special place in coal petrology and the coal industry. Recognized by its bright, glassy appearance and distinctive banding within coal seams, vitrain is a lithotype that…
Durain coal
This article examines Durain coal, a regional coal type with distinct geological, economic and industrial attributes. It explores where Durain coal is found and mined, its chemical and physical characteristics,…
Clarain-rich coal
Clarain-rich coal is a specific lithotype of banded coal that combines distinctive petrographic features with important industrial properties. This article reviews what clarain is, where such coals are found and…
Fusain-rich coal
Fusain-rich coal is a distinctive variety of coal in which fragments of fossil charcoal, known collectively as fusain, are abundant. These coals preserve a record of ancient paleo-wildfires and the…
Weathered coal
Weathered coal is a distinct category of near-surface coal that has been altered by exposure to air, water, temperature changes and biological activity. This alteration changes its physical, chemical and…
Oxidized coal
This article examines the phenomenon of oxidized coal: what it is, where it forms and occurs, how it is mined and handled, and what its economic, industrial and environmental implications…
Inertinite-rich thermal coal
This article examines inertinite-rich thermal coal: its geological origins, where it is found and mined, its physical and chemical properties, industrial uses, economic importance, market dynamics and environmental implications. The…
Vitrinite-rich coking coal
Vitrinite-rich coking coal is a specialized category of coal that plays a central role in the production of metallurgical coke and, by extension, in global **steel** manufacture. Characterized by a…
