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USA | |
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| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
| Palache, C. (1907): Phenakite as an Alteration Product of Danalite From Gloucester, Mass. (American Journal of Science 24:252-255) |
| P Cristofono collection , 2009 |
| P. Cristofono collection 2011 |
| [var. Specularite] |
| Sears, John Henry (1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County |
| McKinstry, H. E. (1921) The minerals of Rockport, Massachusetts. American Mineralogist, 6 (3) 56-60 |
| Dale, Thomas Nelson (1908): The Chief Commercial Granites of MA, NH, and RI. USGS Bulletin 354. |
- Rockport Granite Company quarries
| Dale, Thomas Nelson (1908): The Chief Commercial Granites of MA, NH, and RI. USGS Bulletin 354. |
| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
| P. Cristofono collection, 2013 |
Blackburn Circle locality, Gloucester, Essex County, Massachusetts, USA