Limonite from Lehigh County, Pennsylvania, USA
USA | |
| Wildlands conservancy, Emmaus , PA "South Mountain Pre. Con. Grnwy, & Trl. Plan" Pg. 7. |
| Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 208. |
| ref.: "Mineralogy of Pennsylvania", by S. G. Gordon, p. 209, 1922, Special Publication No. 1 The Academy of Natural Sciences of Philadelphia |
| Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania |
Rocks & Min.: 6:26 10:33-36, 58. | |
| Topographic & Geologic Survey of Pennsylvania, Report #4, The Mineral Pigments of Penna.: 29-30. |