Columbite-(Fe)-Columbite-(Mn) Series from
USA | |
| Mineralogy of Pennsylvania-1922 Samuel S. Gordon, pg. 171 |
| The Mineralogy of Pennsylvania 1966-1975: Robert C. Smith II |
| Gordon's Mineralogy of Pennsylvania (1922) p. 191 |
Gordon, S.G. (1922) The Mineralogy of Pennsylvania. Special Publication No.1, The Academy of Natural Sciences of Philadelphia, 255 pages, at p.191. | |
| Rocks & Min.: 59:109-120 & 62:176-178. |
| Rocks & Min.: 59:109-120 & 62:176-178. |
| Ref.) The Minerology of Pennsyvania Samuel S. Gordon - 1922 Pg. 197-198 |
Steidler pegmatite, Wagontown, Valley Township, Chester County, Pennsylvania, USA