![](http://www.alamy.com/thumbs/6/F00FDA74-D74D-4371-9ACC-03F43DCADDAD/C0DGN2.jpg)
Gilsonite (North American Asphaltum) is a natural form of asphalt.
Gilsonite (North American Asphaltum) is a natural form of asphalt.
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Photo credit: © Susan E. Degginger / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: american, asphalt, asphaltite, asphaltum, cutout, cutouts, geology, gilsonite, hydrocarbon, isolated, mineralogy, natural, north, rock, rocks, sample, silo, silos, specimen, specimens, uintaite