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USA | |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
| Dana 6:1070 Rocks & Min.:10:110. |
| Minerals of Maryland (1940) Ostrander & Price Minerals of maryland (1940) Ostrander & Price, JR. |
| Ostrander & Price (1940), Minerals of Maryland: 27. Rocks & Min.: 21:144-145 |
| Beard, R. (2015) Rockhounding Delaware, Maryland, and the Washington, DC Metro Area |
| [var. Oligoclase] USGS Bull. 426 |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
| Stuart Herring |
| Singewald, J. T. (1928) Notes on feldspar, quartz, chrome and manganese in Maryland: Maryland Geological Survey vol. 12 part 2: 106-107. 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: 799. |
| 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. |
| 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: 814. |
| Singewald, J. T. (1928) Notes on feldspar, quartz, chrome and manganese in Maryland: Maryland Geological Survey vol. 12 part 2: 91-194. |
| 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: 814. |
| Sinkankas, John (1981) Emerald and other beryls. Chilton Book Co, Pennsylvania. 665pp. |
| 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. |
| Singewald, J. T. (1928) Notes on feldspar, quartz, chrome and manganese in Maryland: Maryland Geological Survey vol. 12 part 2: 106-107. 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: 799. |
| [var. Oligoclase] USGS : Wissahickon Formation |
| Mines of the Washington D.C Area |
| [var. Oligoclase] USGS Bull. 426 |
| Mines of the Washington D.C Area |
| Ref.: Minerals in the Washington D.C. Area. |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
| Betts, John (n.d.) John Betts website listing. |
| American Mineralogist (1926) 11:35-38 Ref.: Minerals in the Washington D.C. Area. |
| Grossman, J. N. & Brearley, A. J. (2003). Cryptic metamorphic effects in chondrules from highly unequilibrated ordinary chondrites: An insidious parent-body process. Lunar and Planetary Science Conference XXXIV, pdf#1584. |
Unnamed marble/pegmatite quarry, Loch Raven, Carney, Baltimore County, Maryland, USA