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USA | |
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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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| Sears, John Henry (1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County |
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| Sears, John Henry (1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County |
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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 , 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] 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.
Emerson, B. K (1882) The Deerfield Dyke and its minerals. American Journal of Science 3rd series XXIV:270-278,349-359. |
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| [Opal-A var. Opal-AN] Emerson, Benjamin K. (1895) A mineralogical lexicon of Franklin, Hampshire, and Hampden counties, Massachusetts. Bulletin Vol. 126. US Geological Survey doi:10.3133/b126 |
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| [Opal-A var. Opal-AN] Emerson, Benjamin K. (1895) A mineralogical lexicon of Franklin, Hampshire, and Hampden counties, Massachusetts. Bulletin Vol. 126. US Geological Survey doi:10.3133/b126 |
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| [Opal-A var. Opal-AN] Emerson, Benjamin K. (1895) A mineralogical lexicon of Franklin, Hampshire, and Hampden counties, Massachusetts. Bulletin Vol. 126. US Geological Survey doi:10.3133/b126 |
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| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
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| [Opal-A var. Opal-AN] P Cristofono collection |
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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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| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
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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] 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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| [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 |
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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] P Cristofono collection |
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| [Opal-A var. Opal-AN] T Mortimer collection |
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| [Opal-A var. Opal-AN] P Cristofono collection |
Ondrick Quarry, Granby, Hampshire County, Massachusetts, USA