Eytons' Earth: The science of clays is an emmense subject to tackle; one can get a PHD in clay science. The chemistry of clays is also a specialty field, especially studying clay as a colloid.
One may thus also get a PHD specializing in colloidal chemistry. To understand the vast world of clay, as it applies to natural medicine and biochemistry and biological sciences, one would require an understanding of both specialized sciences. Skeptical? See the fantastic research of Sandia National Laboratories and other clay science research.
