asphaltum - définition. Qu'est-ce que asphaltum
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Qu'est-ce (qui) est asphaltum - définition

SEDIMENTARY ROCK
Asphaltum; Uintaite; Uintahite; North American Asphaltum; Gilsonite
  • Bonanza]], [[Utah]]
  • Gilsonite pahoehoe paralava. This remarkable specimen is from gilsonite which was melted in a wildfire in 2012. While molten, it developed a smooth to ropey top surface much like [[pahoehoe]] basalt lava. Exhibit at the [[Utah Field House of Natural History]].

asphaltum         
n.
Asphaltum         
·noun A composition of bitumen, pitch, lime, and gravel, used for forming pavements, and as a water-proof cement for bridges, roofs, ·etc.; asphaltic cement. Artificial asphalt is prepared from coal tar, lime, sand, ·etc.
II. Asphaltum ·noun Mineral pitch, Jews' pitch, or compact native bitumen. It is brittle, of a black or brown color and high luster on a surface of fracture; it melts and burns when heated, leaving no residue. It occurs on the surface and shores of the Dead Sea, which is therefore called Asphaltites, or the Asphaltic Lake. It is found also in many parts of Asia, Europe, and America. ·see Bitumen.
Asphaltite         
·adj Asphaltic.
II. Asphaltite ·adj Asphaltic.

Wikipédia

Asphaltite

Asphaltite (also known as uintahite, asphaltum, gilsonite or oil sands) is a naturally occurring soluble solid hydrocarbon, a form of asphalt (or bitumen) with a relatively high melting temperature. Its large-scale production occurs in the Uintah Basin of Utah and Colorado, United States. Although the substance has been historically mined in the Uintah Basin, resources are being discovered and mined more recently in other countries such as Colombia and Iran. 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 approximately 25 years later by Samuel H. Gilson.