Vitrain
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Vitrain is a lithotype of coal formed from the bark of large plants. Known for its glossy appearance, vitrain typically occurs in thin bands, between 3 and 10 millimeters in width.[1][2] It has a brittle texture and typically forms cubical pieces when broken.[3] Chemically, vitrain stands out among coal lithotypes by hosting large concentrations of germanium.[4] Combustion of vitrain proves a vital source of germanium production, where the element can be extracted from the leftover ash.
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