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Mineral matter comprises the inorganic components of coal. When coal is burnt the composition of the mineral matter is altered by evolution of the water of hydration of the minerals, (this is not determined during the total moisture determination) and other components such as carbon dioxide and sulphur oxides. The end product, the ash, thus has a different composition to the original mineral matter.
The mineral matter content of coal is difficult to determine but well known empirical equations are usually employed to estimate it.
