40.—Kaolin.
Occurs in beds; it is a fine, white clay, plastic when wet; when dry is scaly or compact; can be crumbled in the fingers and feels gritty; adheres to the tongue; does not dissolve in acids.
Value.—Used for the finest porcelain and for adulterating candy.
Localities.—Found generally with iron-ore and fire-clay. Common on the eastern slope of the Alleghanies; Branford, Vt.; Beekman, Athol, Johnsburgh and McIntyre, N. Y.; Perth Amboy, N. J.; Reading, Tamaqua and New Garden, Penn.; Mt. Savage, Md.; Richmond, Va.; Newcastle and Wilmington, Del.; Edgefield, S. C.; near Augusta, Ga.; Jacksonville, Ala.