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. Gilsonite is mined in underg...
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http://en.wikipedia.org/wiki/Gilsonite
(from the article `asphalt`) ...applications even today. The Pitch Lake on the island of Trinidad was the first large commercial source, but natural sources have since declined ... Asphaltites are commonly classified into three groups: Gilsonite (or uintaite), glance pitch (or manjak), and grahamite. These substances differ from ... ...
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http://www.britannica.com/eb/a-z/g/32
A natural asphaltic bitumen found in veins near the Colorado/Utah border, in the Uinta Basin. Gilsonite is a lustrous black solid, used in paints and coating and insulating materials, and, more recently, converted to coke, gasoline, and gas.
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http://www.daviddarling.info/encyclopedia/G/gilsonite.html
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