What is "duxit"

Duxit is a mostly black brown fossil resin from Miocenes lignite layers in the northern Bohemia. The resin is first mentioned in 1874 by Christian Dölter. It is named after the small Czech town Duchcov (German: Dux) in northern Bohemia, where it was found in the lignite mining Emeran. Not far from Duchcov Duxit is found since the 1980s in a lignite workhouse at Bílina. In the lower section of the mined here lignite occur grade category tree residues with Duxit. Mostly it involves Taxodium.