There are also the rich deposits of red, gray, yellow and white clay.

As Farinelli carried her steadily along the dusty gray clay road, she studied the approach to the keep instead.

He scratched at the surface of one wall, and found more gray clay beneath.

Black and dark grey clays indicate a moderate or high organic carbon content.

Stool that is light in color - like grey clay - can also mean trouble if it's a change from what you normally see.

Color flowed over the surface of the gray clay.

The region is covered by red, brown and grey clays.

Katya did not reach for the gray explosive clay.

Hubert Adrian turned the color of dirty grey clay, his hand shaking violently.

Other crew members sifted the clumpy gray clay to remove any rocks.