| Company | Phone | Website |
|---|---|---|
| Alorhum S.A. de C.V. | +52 81 8881 6300 | alorhum.mx |
| Covia Corporation | (800) 243-9004 | www.coviacorp.com |
| Franklin Industrial Minerals/H.C. Spinks Clay Company, Inc. | (615) 259-4222 | www.lhoist.com |
| Imerys Ceramics | (770) 645-3300 | www.imerys-ceramics.com |
| Old Hickory Clay Company | (270) 247-3042 | www.oldhickoryclay.com |
| Sibelco North America, Inc. | (704) 420-7910 | www.sibelco.com |
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