Other sources of clay and related materials

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: http://wardsci.com
Source of a variety of mineral standards and teaching aids.

Excalibur Mineral Corporation
Charlottesville, VA
Phone: (434) 964-0875
email: info@excaliburmineral.com
Stocks over 200,000 mineral specimens from localities worldwide.