Light micrograph of the polished surface of clarain, a lithotype of bituminous coal. This sample is rich in vitrinite macerals. This type of clarain is fragile and breaks easily. A wide fracture runs perpendicular to the microbands of this clarain. The black shape within the fracture are bubbles and are artifacts of slide preparation. Coal is a sedimentary rock that occurs in stratified deposits. It forms from dead vegetation that was buried deep in the Earth during the Carboniferous Period and subjected to high temperatures and pressure. Solar energy stored by the plants from photosynthesis was trapped in the coal and is released upon combustion. Coal is the largest source of energy in the production of electricity worldwide. Field of view size: 0.74 x 1.11 millimetres.
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