One of the mysteries of the English language finally explained.
A very pure, shiny, brittle black form of asphalt, used in making inks, paints, and varnishes.
- ‘In the 1990s the state led the nation in beryllium and Gilsonite production.’
- ‘A general guideline is that 3% binder replacement with Gilsonite will double the viscosity of a binder.’
Late 19th century: named after Samuel H. Gilson, 19th-century American mineralogist, + -ite.
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