shale

4 ENTRIES FOUND:

shale

Any of a group of fine-grained, laminated sedimentary rocks consisting of silt- and clay-sized particles. Shale constitutes roughly 60% of the sedimentary rock in the Earth's crust. Shales are commercially important, particularly in the ceramics industry. They are a valuable raw material for tile, brick, and pottery and constitute a major source of alumina for portland cement. In addition, advances in recovery methods may one day make oil shale a practical source for liquid petroleum.

This entry comes from Encyclopædia Britannica Concise.
For the full entry on shale, visit Britannica.com.

Seen & Heard

What made you look up shale? Please tell us what you were reading, watching or discussing that led you here.

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More