Gilsonite, also known as uintahite or asphaltum, is a bitumen-impregnated rock (asphaltite) mainly found in the Uintah Basin of Utah and Colorado, United States. It is a naturally occurring solid hydrocarbon bitumen. Although it occurs also in other locations, its large-scale production occurs only in the Uintah Basin.
The mineral Gilsonite is categorized as a solvable material in oil solutions such as CS2 or TCE (Trichloroethylene). Major component of Gilsonite is Carbon, while it contains several other elements including Nitrogen and Sulphur and some volatile matters.
Gilsonite is mined in underground shafts and resembles shiny black obsidian. Discovered in the 1860s, it was first marketed as a lacquer, electrical insulator, and waterproofing compound about twenty-five years later by Samuel H. Gilson.
By 1888 Gilson had started a company to mine the substance, but soon discovered the vein was located on the Uintah and Ouray Indian Reservation. Under great political pressure Congress removed some 7,000 acres (28 km2) from the reservation on May 24, 1888 to allow the mining to proceed legally. Gilsonite mining became the first large commercial enterprise in the Uintah Basin, causing most of its early population growth.
Natural Bitumen (Gilsonite) reserves are spread over the globe in quite a lot of regions especially within basins. With regards to the geological nature of each area, natural bitumen can be found in different forms. 
This unique mineral is used in more than 160 products, primarily in dark-colored printing inks and paints, oil well drilling muds and cements, asphalt modifiers, foundry sand additives, and a wide variety of chemical products. The trademark, registered in 1921, belongs to the American Gilsonite Company.
Mining Gilsonite during World War II was by hand, using a six-pound pick and then shoveling the ore into 200 pound sacks, which were sewn by hand. In 1949 at the Parriette Gilsonite mine near Myton, Utah, Reed Smoot McConkie set the world record for ore mined by hand. Using his pick and shovel, he mined 175 bags of ore in an 8-hour day, 950 bags in a six-day week, 1925 bags in a month and 15,000 bags in one year.
Gilsonite-brand uintahite's earliest applications included paints for buggies and emulsions for beer-vat lining. It was used by Ford Motor Company as a principal component of the japan black lacquer used on most of the Ford Model T cars.
Gilsonite is one of the key ingredients in Minwax wood stain.
- Boden, Taylor; Tripp, Bryce T. (2012). Gilsonite Veins of the Uinta Basin, Utah. Utah Geological Survey. pp. 2–3. ISBN 9781557918567.
- "Gilsonite". zista.co. Retrieved 2016-03-11.
- Transactions of the American Institute of Mining; Locke, Joseph; 1887.
- Burton, Doris Karren (January 1996). A History of Uintah County: Scratching the Surface. Utah Centennial County History Series. Salt Lake City: Utah State Historical Society. pp. 130–134. ISBN 0-913738-06-9.
- "Gilsonite.pro". First Online International Gilsonite Database.
- American Gilsonite Company
- Lamm, Michael; How Cars Got Colors; Invention and Technology Magazine, Spring 1997, Volume 12, Issue 4.