dysodile

from The Century Dictionary.

• noun A kind of greenish- or yellowish-gray coal occurring in masses made up of foliaceous layers, which when burning emits a very fetid odor.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Min.) An impure earthy or coaly bitumen, which emits a highly fetid odor when burning.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mineralogy An impure earthy or coaly bitumen, which emits a highly foetid odour when burning.