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Linkpot cut, Airline Railroad, East Hampton (Chatham), Middlesex Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 35' North , 72° 29' West
Latitude & Longitude (decimal): 41.58333,-72.48333
Köppen climate type:Dfb : Warm-summer humid continental climate

A small, unusual pegmatite cropping out at what Schooner (1958) (the reported discoverer in 1938 - see Zodac (1940)), called the "Second Long Railroad Cut East of East Hampton" and what Weber and Sullivan (1995) called the "Linkpot railroad cut". It is along the former Airline Railroad trail and is reached by heading east from the parking area at the end of Smith Street. Schooner, in Zodac (1940) says that "The chlorophane occurs as a small vein, 1 inch wide, in a 2-foot pegmatite dike, 8 ft. off the ground and about 50 ft. from the beginning [west end] of the cut." The trail is now State of Connecticut land and collecting is not allowed without a permit from the Dept. of Energy & Environmental Protection.

The association of allanite-(Ce), bastnaesite-(Ce), fluorite, chalcopyrite, pyrite, plagioclase, and quartz makes it unusual for the Middletown pegmatite district.

Installation of an underground sewer line along the path unearthed additional minerals such as scheelite.

Mineral List

27 valid minerals. 1 erroneous literature entry.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Ordovician - Cambrian
443.8 - 541 Ma

ID: 2851357
Brimfield Schist (Includes Hamilton Resevoir Formation)

Age: Paleozoic (443.8 - 541 Ma)

Stratigraphic Name: Brimfield Schist; Hamilton Resevoir Formation

Description: Gray, rusty-weathering, medium- to coarse-grained, interlayered schist and gneiss, composed of oligoclase, quartz, K-feldspar, and biotite, and commonly garnet, sillimanite, graphite, and pyrrhotite. K-feldspar partly as augen 1 to 3 cm across. Minor layers and lenses of hornblende- and pyroxene-bearing gneiss, amphibolite, and calc-silicate rock.

Comments: Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Merrimack Synclinorium; Brimfield Schist and equivalent formations (includes Tatnic Hill Formation) (Upper? and Middle Ordovician). The age of the Brimfield Group in this area is Cambrian(?) based on the intrusion of 440 my Hedgehog Hill gneiss in the top of the Hamilton Reservoir Formation in the upper part of the Brimfield, although the top of the Brimfield may be Ordovician or older Paleozoic (Pease, 1989) per CT013.

Lithology: Major:{schist,gneiss}, Minor:{amphibolite,calc silicate rock}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page 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.


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Zodac, Peter. (1940), A Chlorophane Occurrence Near East Hampton, Conn. Rocks & Minerals: 15(11): 376.
Schooner, Richard. (1958), The Mineralogy of the Portland-East Hampton-Middletown-Haddam Area in Connecticut (With a few notes on Glastonbury and Marlborough). Published by Richard Schooner; Ralph Lieser of Pappy’s Beryl Shop, East Hampton; and Howard Pate of Fluorescent House, Branford, Connecticut.
Schooner, Richard. (1961), The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Januzzi, Ronald. (1976), Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury.
Robinson, George W. and Vandall T. King. (1988), What's New in Minerals? Mineralogical Record: 19(5): 332.
Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 403.

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