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Stone classification: Quartz
| Wall Number Sort descending | Country | State | Source | Description |
|---|---|---|---|---|
| 10LA35 | United States | Minnesota | Duluth | reddish-brown, fine grain, compact, porphyry |
| 10RB49 | United States | Wisconsin | Marquette | dark gray, coarse grain, compact, Porphyritic |
| 11RB40 | United States | Wisconsin | Brandon | nearly black, coarse grain, compact, Porphyritic |
| 5LA27 | Austria | South Tyrol | Red, spotted with white, medium grain, Porphyritic | |
| 5RB28 | Austria | South Tyrol | reddish, white-spotted, medium grainquartz, Porphyritic | |
| 5RB34 | United States | Minnesota | Lake Co. | dull-red, fine grain, compact, porphyry |
| 6La19 | United States | Pennsylvania | Pine Grove | dull-red, coarse grainy, quartz porphyry |
| 7LB23 | United States | North Carolina | Charlotte | white, dark-spotted, Leopard Rock, Porphyritic |