Well, the possibilities are endless. Green coal is what you look up as a greenhorn and need classes, or may be glasses. Then, there is coal out of Greenland. Actually, I only know they get coal out of Svalbard, which is North of Iceland. Now, if you have a coal seam exposed to the atmosphere, there may be some mosses attached. Nice green. Actually, there is brown coal or also called lignite. The developmental intermediate between bog and anthracite.

I am truly green to this subject and don't know about green coal classes either. Sorry for making fun about it, but this just asks for some nonsense feedback.

Dietrich