Bitumen-impregnated rocks

thumb|A shungite-bearing rock (left) and solid bitumen shungite (right) Shungite is either a diverse group of metamorphosed Precambrian rocks all of which contain pyrobitumen, or the pyrobitumen within those rocks. It was first described from a deposit near Shunga village, in Karelia, Russia, from where it gets its name. Shungite is most widely known for pseudoscientific and quack medical claims about its uses in medicine and technology, where it is claimed to have properties ranging from nebulous health benefits to blocking 5G radiation.

Anthraconite (also spelled as anthraxonite) or stinkstone is a form of black to grey, bituminous bearing marble, calcite or limestone which produces an unpleasant odour when struck or rubbed. It is also known as pietra fetida. It is thought to have been formed when limestone is deposited under anaerobic conditions. Some anthraconite releases enough petroleum when struck, that it may be lit. At least one locality where it is found is in the vicinity of Traverse City, Michigan.