Nut coal
Nut coal is a widely recognized commercial grade of coal, principally defined by its particle size and practical applications rather than by a single chemical composition. It occupies a middle…
Coal with high liptinite content
This article examines coals that are unusually rich in liptinite macerals — a group of organic constituents in coal that derive from spores, cuticles, resins and algal materials. Such coals…
