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Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 56' 16'' North , 72° 44' 22'' West
Latitude & Longitude (decimal): 41.9377777778, -72.7394444444
Quarry in the Jurassic (205 mya) Holyoke Basalt. Mineralization occurs in gas vesicles (pockets) and in fault zones, some of them heavily brecciated and recemented with fine-grained calcite.

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"Barf" Datolite by Paul Gilmore

Mineral List

32 entries listed. 20 valid minerals. 1 erroneous literature entry.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Wolfe, C. W. and Vilks, I. (1960): Pseudomorphs after Datolite, Prehnite and Apophyllite from East Granby, Connecticut. American Mineralogist: 45: 443-447.

Ryerson, Kathleen, H. (1972): Rock Hound's Guide to Connecticut. Pequot Press.

Hubert, John F., Paul E. Feshbach-Meriney and Michael A. Smith. (1992). The Triassic-Jurassic Hartford Rift Basin, Connecticut and Massachusetts: Evolution, Sandstone Diagenesis, and Hydrocarbon History. AAPG Bulletin: 76(11).

Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 398.

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