gilsonite

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gilsonite

[′gil·sə‚nīt]
(mineralogy)
A variety of asphalt; it has black color, brilliant luster, brown streaks, and conchoidal fracture.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

gilsonite, uintahite

A naturally occurring grade of asphalt used in floor tile, paints, paving, and roofing.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.