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Peat is often regarded as the initial phase in the extensive coal formation process. It forms in waterlogged regions like swamps and bogs, where decaying plant matter accumulates without adequate oxygen. This low-oxygen setting prevents complete decomposition, enabling the formation of peat. The unique conditions allow the plant material to transform into a dense, brown mass.
While peat contains less carbon than later stages, its presence in global landscapes offers an essential foundation for the formation of coal. Peat has utility as a fuel source in certain regions, though its energy output is considerably lower. Primarily, it is used where other fuel sources are scarce, but it also acts as a precursor in the coalification sequence.

Progressing from peat, we encounter lignite, often known as brown coal due to its color. As peat experiences increasing pressure and slight heat over long durations, it compacts and begins to weave its way into lignite form. This stage holds more carbon and less moisture compared to peat, offering a somewhat higher energy potential.
Despite its increased carbon content, lignite remains relatively soft and fragile. It is abundant worldwide and largely used to generate electricity, but it remains less efficient as an energy source. Its moisture-rich composition limits its practical application, often rendering it as transitional in the coalification continuum.

Bituminous coal, prominently referred to as 'soft coal', marks a substantial upgrade in carbon concentration and energy capability. As lignite experiences further compression and intense heat, it evolves into this denser material. This type of coal becomes a major asset in both electricity production and industrial settings like steel manufacturing.
Known for its lustrous black appearance, bituminous coal is characterized by its significant heating value, which surpasses that of lignite. The increased carbon density, approximately 45-86%, facilitates various applications. Despite being termed 'soft', it is much harder and less crumbly compared to lignite, making it a widely preferred energy source in multiple sectors.

Anthracite coal crowns the coal formation hierarchy as the highest grade in the coalification process. With its remarkable carbon content, ranging from 86% to 97%, it emerges as the winner in terms of energy potential. Occurring as a result of the strongest metamorphic transformations, anthracite is subject to the highest pressure and temperature conditions.
This deeply metamorphosed coal is notably dense, black, and glossy, possessing the highest energy content. Unlike earlier stages, anthracite burns the cleanest, prompting its use primarily in residential and commercial heating. Its efficiency makes it indispensable where minimal emissions and higher energy yields are priorities.