Description
An abundant sedimentary rock consolidated from layers of clay and mud. Shale has very fine grains and a laminated structure that fractures easily along the bedding lines. The stone is soft, smooth, and can feel greasy. Shale is composed of clay (>30%) and silica along with smaller quantities of carbonates, feldspars, iron oxides, fossils, and organic matter (called shale oil). Shale oil, or kerogen, is a sulfurous hydrocarbon that can be refined as a source of fuel. Shale can vary in color from gray, brown, black, green, or red. Shale is used in the manufacture of ceramics, tile, and brick. It is also a source of alumina for portland cement.
Synonyms and Related Terms
layered mudstone; skifer (Dan.); Schiefer (Deut.); schiste (Fr.); schalie (Ned.); argilito (Port.)
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Last updated on: 7/13/2009 11:52:51 AM
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