GILSONITE (so named after S. H. Gilson of Salt Lake City), or UINTAHITE, or UINTAITE, a description of asphalt occurring in masses several inches in diameter in the Uinta (or Uintah) valley, near Fort Duchesne, Utah. It is of black colour; its fracture is conchoidal, and it has a lustrous surface. When warmed it becomes plastic, and on further beating fuses perfectly. It has a specific gravity of 1-065 to 1-070. It dissolves freely in hot oil of turpentine. The output amounted to 10,916 short tons for the year 1905, and the value was $4-31 per ton.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)