Allophane from Delaware County, Pennsylvania, USA
USA | |
| The Mineralogy of Pennsylvania 1922 Samuel Gordon pg. 185 |
| Rocks & Min.: 59:109-120 & 62:176-178. |
USA | |
| The Mineralogy of Pennsylvania 1922 Samuel Gordon pg. 185 |
| Rocks & Min.: 59:109-120 & 62:176-178. |