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USA | |
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| [var. Sardonyx] Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
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| Cook, Robert B., Smith, W. Everett (1982) Mineralogy of Alabama. Bulletin 120. Geological Survey of Alabama |
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| Arkansas Geological Survey |
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| Howard, J. Michael (2007) Bulletin Vol. 23, Mineral Species of Arkansas - A Digest (2nd ed.) Arkansas Geological Commission |
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| www.gamineral.org (n.d.) http://www.gamineral.org/forrest-city-copperus-creek.htm |
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| Howard, J. Michael (2007) Bulletin Vol. 23, Mineral Species of Arkansas - A Digest (2nd ed.) Arkansas Geological Commission |
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| Howard, J. Michael (2007) Bulletin Vol. 23, Mineral Species of Arkansas - A Digest (2nd ed.) Arkansas Geological Commission
Howard, J. Michael (1987) Mineral Species of Arkansas - A Digest. Bulletin Vol. 23 (1st ed.) Arkansas Geological Commission |
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| www.gamineral.org (n.d.) http://www.gamineral.org/forrest-city-crow-creek.htm |
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| Goldstein, Alan (2006) Kentucky Mineral: Locality Index. Rocks & Minerals, 81 (6) 420-440 doi:10.3200/rmin.81.6.420-440 |
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| Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
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| Goldstein, Alan (2006) Kentucky Mineral: Locality Index. Rocks & Minerals, 81 (6) 420-440 doi:10.3200/rmin.81.6.420-440 |
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| Kentucky Agate, McIntosh and warren, 2013. |
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| Zeitner, June Culp (1968) Appalachian Mineral & Gem Trails. Lapidary Journal, Inc. |
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| Goldstein, Alan (2006) Kentucky Mineral: Locality Index. Rocks & Minerals, 81 (6) 420-440 doi:10.3200/rmin.81.6.420-440 |
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| Goldstein, Alan (2006) Kentucky Mineral: Locality Index. Rocks & Minerals, 81 (6) 420-440 doi:10.3200/rmin.81.6.420-440 |
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| Goldstein, Alan (2006) Kentucky Mineral: Locality Index. Rocks & Minerals, 81 (6) 420-440 doi:10.3200/rmin.81.6.420-440 |
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| Goldstein, Alan (2006) Kentucky Mineral: Locality Index. Rocks & Minerals, 81 (6) 420-440 doi:10.3200/rmin.81.6.420-440 |
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| Gemstone - Arkansas Geological Survey |
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| Conroy, Kevin (2023) Personal Communication. |
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| Sherwood, Mark D., Williams, Glenn A. (1998) Missouri Mineral Locality Index. Rocks & Minerals, 73 (2) 98-117 doi:10.1080/00357529809603046 |
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| Sherwood, Mark D., Williams, Glenn A. (1998) Missouri Mineral Locality Index. Rocks & Minerals, 73 (2) 98-117 doi:10.1080/00357529809603046 |
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| Sherwood, Mark D., Williams, Glenn A. (1998) Missouri Mineral Locality Index. Rocks & Minerals, 73 (2) 98-117 doi:10.1080/00357529809603046 |
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| Conroy, Kevin (2023) Personal Communication. |
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| Neil H. Suneson, William G. Lyon, David Goza (2013) Boley Agate — Chert Breccia Clasts In The Vamoosa Formation. Shale Shaker 64:22-37 |
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| Rock & Minerals Vol. 84 No. 4 Jul/Aug 2011 |
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| Paris, Travis A. (2011) Tennessee Mineral Locality Index. Rocks & Minerals, 86 (4) 300-329 doi:10.1080/00357529.2010.517132 |
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| LapJourn. 16(11):1012 |
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| Paris, Travis A. (2011) Tennessee Mineral Locality Index. Rocks & Minerals, 86 (4) 300-329 doi:10.1080/00357529.2010.517132
Zeitner, June Culp (1968) Appalachian Mineral & Gem Trails. Lapidary Journal, Inc. |
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| Paris, Travis A. (2011) Tennessee Mineral Locality Index. Rocks & Minerals, 86 (4) 300-329 doi:10.1080/00357529.2010.517132 |
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| Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
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| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
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| Agates from Alpine, Texas. Rocks and Minerals, v. 19, no. 8, p. 246. |
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| USGS Bull 585 |
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| www.austingemandmineral.org |
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| |
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| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622
http://www.omsinc.org/archives/Ore-cutts_Jan04.pdf |
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| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
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| Big Bend Country: Lapidary Journal, v. 16, no. 5, p. 527-530. |
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| Self-Collected In August 2005 by David Aldridge and Wayne Aldridge |
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| Personally collected |
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| Wonderful west Texas: Lapidary Journal, v. 27, no. 10, p. 1534-1542. |
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| A. R. Ploudre, Lapidary Journal, v. 42, no. 2, p. 101 |
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| Brian Cowger |
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| Personal collection acquired on site |
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| Mitchell, James R. (1987) Gem Trails of Texas, Gem Guides Book Co., 14-15. |
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| Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
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| Nicolay & Stone (1967), Rocks & Minerals: A Guide For Collectors of the Eastern US |
Blackwell Mine, Tiff, Washington County, Missouri, USA