Maceral - Wikipedia
A maceral is a component, organic in origin, of coal or oil shale. The term 'maceral' in reference to coal is analogous to the use of the term 'mineral' in reference to igneous or metamorphic rocks. Examples of macerals are inertinite, vitrinite, and liptinite. [1]
Macerals, Coal, Kentucky Geological Survey, University of Kentucky
2023年1月5日 · On the microscopic level, coal is made up of organic particles called macerals. Macerals are the altered remains and byproducts of the original plant material from which the coal-forming peat originated. Macerals are to coal as sediment grains and cements are to sedimentary rocks.
Coal MaceralsTutorial | Petrographic Atlas | SIU
Coal is a rock formed by geological processes and is composed of a number of distinct organic entities called macerals and lesser amounts of inorganic substances - minerals. The essence of the petrographic approach to the study of coal composition is the idea that coal is composed macerals, which each have a distinct set of physical and ...
Coal Macerals | Indiana Geological & Water Survey
Macerals are microscopically recognizable constituents of organic matter in coal. The term maceral was first used by Stopes in 1935 for a component of coal detected under a microscope. Over the years, the ICCP has established standard rules for maceral analysis, maceral definitions and classifications.
Maceral | Definition & Facts | Britannica
maceral, any of the numerous microscopically recognizable, individual organic constituents of coal with characteristic physical and chemical properties. Macerals are analogous to minerals in inorganic rocks, but they lack a definite crystalline structure.
Coal Macerals - an overview | ScienceDirect Topics
The maceral (organic matter) composition in coal plays an important role in the transformation of the coal structure during gasification as each group reacts differently. Coal macerals are grouped as vitrinite, liptinite, and inertinite, where each group has specific physical and chemical properties ( Matsuoka et al., 2006; Oboirien, 2011 ).
All of the papers in this book deal with the chemistry and characterization of coal macerals and, as such, recognize the heterogeneous nature of coal. Coal is, in fact, a rock derived from a variety of plant materials which have undergone a variety of physical and chemical transformations.
Influence of coal particle composition and maceral associations …
2024年12月23日 · The three distinct coal maceral groups of inertinite, vitrinite and liptinite, each including several maceral types, can be identified by their relative greyness in reflected light under a microscope. Vitrinite, liptinite and part of semifusinite are classed as reactive macerals owing to their tendency to soften on heating, ...
Coal Macerals - SpringerLink
2016年1月1日 · Microscopically basic coal constituent is maceral which is synonymous to minerals in inorganic rocks. However, there is a difference between mineral and maceral. Minerals are generally inorganic crystalline in nature and has got a definite chemical composition, whereas a maceral is a noncrystalline organic substance and its composition may vary ...
Maceral - an overview | ScienceDirect Topics
2.2.2 Coal macerals. Not surprisingly, the maceral distribution in a coal is heterogeneous, with individual domains varying from 1 μm to 1 mm (Figure 2.1). Maceral compositions reflect the botanical origins of coals and the environmental conditions during their deposition.