The phrase "a mixture of clay" is correct and usable in written English.
It can be used when describing a combination of clay with other materials or elements, often in contexts related to art, construction, or geology.
Example: "The artist created a sculpture using a mixture of clay and other natural materials to enhance its texture."
Alternatives: "a blend of clay" or "a combination of clay".
Clay ironstone, a mixture of clay and siderite (iron carbonate), sometimes occurs as layers of dark-gray to brown, fine-grained nodules overlying coal seams.
The technique involves tampering a mixture of clay and sand into building blocks.
There are also patchy deposits of brick earth, a mixture of clay and sand often excavated for building materials.
It's a mixture of clay, sand and gravel, which when properly rolled, binds together to make a reasonably durable surface.
İznik ware was soft and sandy, being of grayish-white clay covered with a thin, usually white slip (a mixture of clay and water).
The oil was once considered too difficult and expensive to extract as it is a mixture of clay, water and bitumen.
SEM/EDS of the four Pasargadae plaster cross-sections showed the characteristic elements of a mixture of clays including carbon, oxygen, magnesium, aluminum, silicon, potassium and calcium and iron.
Warren Hill itself is composed of Tertiary Bracklesham Beds, a mixture of clays and marls with overlying sandy and lignitic beds.
Be aware that they are both made from a mixture of clays and other materials, then kiln-fired to approximately 1400 degrees.
These structures are typically built with cob — a mixture of mud, sand, clay and chopped straw molded to form durable, elegant, super-insulated, earthquake-resistant structures.
The foam is roughly shaped to the car's dimensions and the designers slather on a two-inch-thick layer of a specialized clay that softens with heat; it is a mixture of actual clay, wax and sulfur additives.
