Granite pegmatite. Originally known as the Fillow quarry. Opened in 1876.
References:
Brush, George J. and Dana, Edward S. (1878): On a new and remarkable mineral locality in Fairfield County, Connecticut (American Journal of Science and Arts, XVI:33-123, July-Dec 1878)
Shainin, V. (1946): The Branchville, Connecticut, Pegmatite (American Mineralogist 31:329-345).
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 851, 876, 938.
Neues Jahrbuch für Mineralogie, Monatshefte (1957), 78.
errors listed in Januzzi and Seaman (1976): Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World
Lapis (1984): 2: 5.
Zanazzi et al. (1986): Deyhdration from switzerite cf. American Mineralogist 71:1224-1228.
minerals listed in error in Tschernich, R. (1992): Zeolites of the World, p.114.
Rocks & Minerals. Vol. 70. No. 6.
Mineral List:83 entries listed. 60 valid minerals. 9 type localities (valid minerals). 3 erroneous literature entries.
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