| Country | State | Classification | Source | WallNo | Centennial | Commercial | Location | surroundPic |
| United States | Pennsylvania | Gneiss | Chester | 6RB18 | 25436 | y | Front Face (South) | Dscf0109.jpg |
Description |
| light gray |
| fine grain |
| garnet |
| biotite-muscovite |
| ||||||||||||||||||||
No 6RB18 is:
| Picture of the Archive Stone: |
Actual Picture from the Stone Wall:
| ||||||||||||||||||