|
USA | |
| [Opal-AN var. Hyalite] Jat Thompson Collection |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland, 27p. |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland, 297p. |
| 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. |
| Rocks & Min.:11:111 19:148. |
| [Opal-AN var. Hyalite] Jat Thompson |
| [Opal-AN] Stuart Herring Collection |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
| [Opal-AN] 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. |
| Bernstein, Lawrence R. (1980) Minerals of the Washington, D.C. area. Maryland Geological Survey Educational Series 5, 148 pages. |
| Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 pages. |
| [Opal-AN] Cordua, Bill (1969) Mineralogy of a newly exposed granite near White Oaks, MD: Rocks and Minerals: 44 (2): 114-115. |
Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA