Coal, containing all the elements that are present in nature and more than 200 minerals, has
a complex chemical structure, making it one of the most complex geological materials …

Peat depositional environments, the sites where and conditions under which peat
accumulates, significantly influence a resultant coal's physical properties, chemical …

Coal is a complex geologic material composed mainly of organic matter and mineral matter,
the latter including minerals, poorly crystalline mineraloids, and elements associated with …

Coal is a resource primarily used for electric power generation, and currently supplies 41%
of global electricity needs. Coal can also be considered as an economic source of …

Rare earth elements and yttrium (REY) have attracted considerable attention over the last
decade because of their vital roles in clean energy, consumer product, national defense and …

A series of 20 coal samples were subjected to sequential leaching with ammonium acetate,
hydrochloric acid, hydrofluoric acid, and nitric acid to quantify the modes of occurrence of …

The material classed as “mineral matter” in coal embraces crystalline mineral materials as
well as a range of inorganic elements that occur in non-crystalline form. This review outlines …

This paper presents data on widespread abnormal accumulations of lanthanides and yttrium
(REY) in many coal deposits worldwide. High REY contents (> 0.1%) have been found in …

China is, and in the coming decades should continue to be, the largest producer and user of
coal in the world. The high volume of coal usage in China has focused attention not only on …

This article addresses the fundamental difference between coal rank and coal type. While
theoretically settled long ago as being different aspects of coal systems science, the two …