Flint clay
| AL2O | 45.00% min |
| Fe2O | 0.60% max |
| H2O | 0.50% max |
| B.D. | 2.50 gr/ccm. min |
| Available size: 0 – 1 mm | 1 – 3 mm | 3 – 5 mm | 5 – 8 mm | Fines/Other available | |
| AL2O | 45.00% min |
| Fe2O | 0.60% max |
| H2O | 0.50% max |
| B.D. | 2.50 gr/ccm. min |
| Available size: 0 – 1 mm | 1 – 3 mm | 3 – 5 mm | 5 – 8 mm | Fines/Other available | |