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Stone description: bluish-gray
| Wall Number | Country | State Sort descending | Classification | Source |
|---|---|---|---|---|
| 8RB11 | Cuba | Marble | Isle of Pines | |
| 8RB12 | Cuba | Marble | Isle of Pines | |
| 11LA22 | Cuba | Marble | Isle of Pines | |
| 11RA24 | Cuba | Marble | Isle of Pines | |
| 13LA22 | Cuba | Marble | Isle of Pines | |
| 13LB23 | Cuba | Marble | Isle of Pines | |
| 12lb39 | United States | Alabama | Limestone | Calera |
| 14LQ | United States | Georgia | Marble | Tate |
| 6LQ | United States | Georgia | Marble | Tate |
| 8LQ | United States | Georgia | Marble | Tate |
| 12LQ | United States | Georgia | Marble | Tate |
| 5LA38 | United States | Maryland | Granite | Bethesda |
| S2-89 | United States | Massachusetts | Granite | Unknown |
| 21EE | United States | New York | Sandstone | Portageville |
| 14LB41 | United States | Ohio | Marble | Spring Mills |
| 6RA7 | United States | Pennsylvania | Sandstone | Derry Station Westmorland Co. |
| 13RB9 | United States | Pennsylvania | Dolomite | Potts Landing Berk's Co. |
| S1-12 | United States | Unknown | Granite | Unknown |
| S1-14 | United States | Unknown | Granite | Unknown |
| 4L3 | United States | Vermont | Marble | W. Rutland |
| 4L4 | United States | Vermont | Marble | W. Rutland |
| 4L5 | United States | Vermont | Marble | W. Rutland |
| 4R3 | United States | Vermont | Marble | W. Rutland |
| 4R4 | United States | Vermont | Marble | W. Rutland |
| 4R5 | United States | Vermont | Marble | W. Rutland |
| S2-137 | United States | Vermont | Marble | Florence |
| 9RA4 | United States | Colorado | Marble | Marble |
| S2-100 | United States | Colorado | Granodiorite | Mountain Cross |
| S2-53 | United States | Colorado | Granodiorite | Mountain Cross |