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USA | |
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| [Opal-A var. Opal-AN] P Cristofono collection , 2009 |
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| [Opal-A var. Opal-AN] P. Cristofono collection 2011 |
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| [Opal-A var. Opal-AN] Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
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| [Opal-A var. Opal-AN] P. Cristofono collection 2011 |
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| [Opal-A var. Opal-AN] P Cristofono collection , 2009 |
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| [Opal-A var. Opal-AN] Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
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| [Opal-A var. Opal-AN] Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
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| [Opal-A var. Opal-AN] P. Cristofono collection, 2013 |
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| [Opal-A var. Opal-AN] Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
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| [Opal-A var. Opal-AN] P Cristofono collection 2010 |
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| [Opal-A var. Opal-AN] P Cristofono collection, 2006 |
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| [Opal-A var. Opal-AN] Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
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| [Opal-A var. Opal-AN] Januzzi, Ron E., Seaman, David M. (1976) Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut, USA.
Rocks & Min.: 21:75. |
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| |
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| [Opal-A var. Opal-AN] Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
|
| [Opal-A var. Opal-AN] Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
|
| [Opal-A var. Opal-AN] P Cristofono collection |
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| [Opal-A var. Opal-AN] P Cristofono collection , 2009 |
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| [Opal-A var. Opal-AN] P. Cristofono collection |
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| [Opal-A var. Opal-AN] P Cristofono collection |
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| [Opal-A var. Opal-AN] P. Cristofono collection 2011 |
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| [Opal-A var. Opal-AN] P. Cristofono collection |
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| [Opal-A var. Opal-AN] P Cristofono collection
P Cristofono collection |
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| [Opal-A var. Opal-AN] P Cristofono collection |
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| [Opal-A var. Opal-AN] P. Cristofono collection |
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| [Opal-A var. Opal-AN] P. Cristofono collection 2011 |
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| [Opal-A var. Opal-AN] P Cristofono collection , 2009 |
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| [Opal-A var. Opal-AN] P. Cristofono collection, 2012 |
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| [Opal-A var. Opal-AN] P. Cristofono collection 2011 |
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| [Opal-A var. Opal-AN] P. Cristofono collection, 2010 |
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| [Opal-A var. Opal-AN] Rocks & Min.:64:504.
Rocks & Minerals 80:4 pp234-241 |
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| Miller, C. E. (1971) Rhode Island Minerals and Their Locations, O. D. Hermes, Ed., University of Rhode Island, Kingston |
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| [Opal-A var. Opal-AN] Gems & Minerals 395 (August, 1970). |
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| Miller, C.E. (1972) Minerals of Rhode Island. Department of Geology, University of Rhode Island, 83 pages. |
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| AmMin 22:279 |
Route 13 area, Lunenburg, Worcester County, Massachusetts, USA