A high-temperature, low-pressure, oxidized and quenched crystallization product derived from fused sediments contiguous to naturally combusted coal seams.
IMA Status:
Approved IMA 1987
Locality:
At Durham ranch, in the Powder River basin, 13 km northeast of Reno Junction and 25 km south of Gillette, Campbell Co., Wyoming, USA. Link to MinDat.org Location Data.
Name Origin:
Named for Eric J. Essene, Professor at the University of Michigan, Ann Arbor, Michigan, USA, and discoverer of the first specimens.
Chemical Formula: 