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      The caustobioliths are combustible organic sediments, which are either of plant (peat, lignite, black coal, anthracite, bone coal) or animal (bituminous shale, asphalt, ozokerite, natural gass) origin.

xylit g5075

uhlí - černé g5143

uhlí - černé g5211

uhlí - hnědé g5227

In the Virtual Museum there are total 46 samples