The Source Clays Repository

The Clay Minerals Society

The repository is able to provide the following source clays. Please include a copy of this form with all orders.


Order Form (pdf format - requires Adobe Acrobat Reader)

Order Form (MS Word Format)


We do not accept purchase orders

Please pay by check, money order or credit card (Visa, Master card and American Express)

Checks or money orders should be made out in U.S. dollars, on a U.S. bank payable to the "Source Clays Repository"

The Source Clays Repository
The Clay Minerals Society
Purdue University

915 West State Street
West Lafayette, IN 47907-2054

Voice (765) 494 4258
FAX (765) 496 2926
Web: (follow links to Source Clays Project)

If you have any questions, please contact the curators:

Cliff Johnston
Darrell Schulze

For general information about the repository, contact Candice Johns



For more information, see the interesting article "The Origin and Development of the Source Clays Program" contributed by William F. Moll

By the early 1970's the need for sources of homogeneous clay samples had become apparent to researchers. Natural deposits are so variable that data generated by different investigators working at the same outcrop often cannot be compared with confidence. Thus the Clay Minerals Society set up the Source Clays Project.

The Society's Source Clay Repository offers two series of materials, the Source Clays and the Special Clays.

The Source Clays are derived from large, reasonably homogenized stocks. Thus, over the years, data on these reference materials can be compared. The samples have been carefully selected from the source deposits by professionals to minimize in situ variations. Because any beneficiation technique can bring about changes in properties, pre-treatment usually involves only low-temperature, steam-fired tray drying, and imp or Raymond mill pulverization. Each original sample consisted of one metric ton.

The Special Clays are rare but of great theoretical interest. No attempt has been made to homogenize or beneficiate them.

Data on the CMS Source Clays are available in the October (2001) issue of Clays and Clay Minerals, Volume 49, Number 5, pages 371-453.

A list of the available Source Clays can be found at:


A list of the available Special Clays can be found at:


A bibliography of literature pertaining to the source clays may be obtained from:


Physical/chemical data for the Source Clays may be obtained at:


Materials Safety Data Sheets for the Source Clays may be obtained at:



The following Source Clays are completely depleted.


  • CorWa-1 Corrensite, Packwood, Washington (Ohanapecosh Form.) Altered Eocene tuff, containing 25-50% corrensite; quartz and plagioclase impurities separable by wet sedimentation. Need new supplier.
  • NG-1 Nontronite, Hohen Hagen, Germany, Nontronite-cemented sand (15-20% nontronite), easily separated by wet sedimentation (Char. by Schneiderhoehn, Tschermaks Min. u. Pet. Mitt., 10, 385-399, 1965). Need new supplier.
  • SepNev-1 Sepiolite, Two Crows, Nevada (pub. ref Clays and Clay Minerals, v. 26, p. 58-64, 1978). Need new supplier.
  • VTx-1 Vermiculite, Llano, Texas, USA, a mixture of magnesite, phlogopite, and vermiculite. The vermiculite can be separated by hand picking. Plans made to replace.

Ordering Information

The prices for Source and Special Clays include Ground UPS within the continental United States. Air postage and Internation Shipping charges are additional. Please contact G.S. Premachandra at (voice 765 494 4258 or FAX 765 496 2926 ) for more information about these charges.

The clays offered by the Source Clays Project change frequently because of new acquisitions and depletion of old supplies. The Source Clays Project is always grateful for new acquisitions, particularly of clays that have become depleted. If you are able to provide access to a new source of source or special clays, please contact the curator

Other Sources of Clays and Related Minerals

Ward's Natural Science Establishment, Inc.
P.O. Box 92912
Rochester, NY 14692-9012

Phone: 800-962-2660
FAX: 800-635-8439
Ward's Natural Science Establishment Web site
Source of a variety of mineral standards and teaching aids.

Minerals Research
31 Sherwood Drive
Brockport, New York 14420

Phone: 585-637-4915
FAX: 585-395-2416
Source of a variety of clay and zeolite hand and reference samples and tetrahedral models of zeolites.

Back to the Clay Minerals Society Home Page