Pronunciation: [ɡlˈans kˈə͡ʊl] (IPA) 
The correct spelling of "glance coal" is actually "glance coke". The word "glance" refers to a type of coal that produces a high-quality coke when heated. The pronunciation of "glance" is /ɡlæns/, with a long "a" sound and a soft "s". Meanwhile, "coke" is pronounced as /koʊk/, with a long "o" and a silent "e". The spelling of the word is important when referring to different types of coal and their properties.
Glance coal, also known as glance pitch, is a type of coal that possesses a distinct shiny appearance or a high lustre. It is characterized by its dark, compact, and smooth texture, which sets it apart from regular coal. Glance coal is typically found in a banded or layered form, often occurring in layers between other types of coal, such as bituminous coal or anthracite.
This unique coal variety gets its distinctive appearance from the high concentration of carbon it contains. It is formed through the process of metamorphosis, as organic materials are subjected to immense pressure and heat over long periods of time. This process eliminates impurities and increases the carbon content, resulting in the formation of glance coal.
Given its high carbon content, glance coal burns with a clean and intense flame, making it an ideal fuel source. It is particularly valued for its high calorific value, which means that it releases a significant amount of energy when combusted. Due to these properties, glance coal has been historically used in various industrial applications, including metal smelting, as it provides a reliable and efficient source of heat.
However, in modern times, the usage and demand for glance coal have significantly declined due to the availability of alternative energy sources and concerns regarding its impact on the environment.
