Gilsonite is a glossy, black, solid hydrocarbon resin similar in appearance to coal or hard asphalt. It is brittle and lightweight and can be easily crushed into powder. Its unique chemical properties identify it as belonging to its own sub-group of the PUB Gilsonite family. Gilsonite occurs naturally in a very pure state, and softens in a range of temperatures according to grade, from 302 to 464 degrees Fahrenheit (150-240 degrees Celsius).

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