What are clays?

Some articles on clay, clays:

Seatearth - Flint Clay
... Another clay associated with coal beds is a smooth, flintlike refractory clay or mudstone composed dominantly of kaolin, called "flint clay" ... Flint clay breaks with a pronounced conchoidal fracture and resists slaking in water ... Flint clay can be either detrital or authegenic in origin ...
English Indian Clays
... English Indian Clays Ltd ... financial collaboration with English China Clays Ltd ... Clay Starch Divisions ...
Ball Clay
... Ball clays are kaolinitic sedimentary clays, that commonly consist of 20-80% kaolinite, 10-25% mica, 6-65% quartz ... Ball clays are relatively scarce deposits due to the combination of geological factors needed for their formation and preservation ...
List Of United States Political Families (B) - The Bentons, Browns, Clays, Fremonts, and McDowells
... The Benton-Brown-Fremont-Clay-McDowell family is a family of politicians from the United States ... Henry Clay (1777–1852), U.S ... Cousin-in-law of James Brown and Henry Clay ...
Prehistoric Medicine - Treatments For Disease - The Use of Earth and Clays
... Earths and clays may have provided prehistoric peoples with some of their first medicines ... Also, early humans could have learned about the use of various healing clays by observing animal behaviour ... Such clay is used both internally and externally, such as for treating wounds, and after surgery (see below) ...