|
USA | |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland, 27p. |
| Bernstein, L.R. (1976) Minerals of Washington D.C. and vicinity. U.S. Geological Survey Open-File Report 76-849, 183 pages. |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
| Rocks & Min.: 19:148. |
| Ref: Minerals of the Washington, D.C. Area |
| Rocks & Min.: 21:274-275. |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland, page 45 |
| Econ Geol (1989) 84:663-675 |
| Heyl, A. & Pearre, N (1965) Copper, zinc, lead, iron cobalt and barite deposits of the Piedmont Upland in Maryland: Maryland Geological Survey: Bulletin 28, 72 p. |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
| Rocks & Min.: 11: 121 Dana 6: 1071. |
| Heyl, A. & Pearre, N (1965) Copper, zinc, lead, iron cobalt and barite deposits of the Piedmont Upland in Maryland: Maryland Geological Survey: Bulletin 28, 72 p. |
| Heyl, A. & Pearre, N (1965) Copper, zinc, lead, iron cobalt and barite deposits of the Piedmont Upland in Maryland: Maryland Geological Survey: Bulletin 28, 72 p. |
| Minerals of Maryland (1940) Charles Ostrander and Walter E. Price, Jr., Natural History Society of Maryland. p. 56 Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
| Pearre, N. & A. V. Heyl (1960) Mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware: U. S. Geological Survey: Bulletin 1082K: 707-833. |
| Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p. |
| reported by Ostrander and Price(1940) but not seen in in dumps by Bernstein (1980) |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
| Bernstein, Lawrence R. (1980) Minerals of the Washington, D.C. area. Maryland Geological Survey Educational Series 5, 148 pages. |
| Jat Thompson Collection |
| J. Wingard Personal Observation 12-05 |
Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA