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Middle Haddam, East Hampton (Chatham), Middlesex Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 33' 14'' North , 72° 33' 2'' West
Latitude & Longitude (decimal): 41.5538888889, -72.5505555556
A village situated along state Route 151 south centered about 1 km south of Cobalt village. It was formerly an important shipbuilding area. Coordinates are for the intersection of state Route 151 and Long Hill Road.

The local bedrock consists of the metavolcanic member of the Ordovician Collins Hill Formation consisting of amphibolite, hornblende schist and light-gray gneiss.

Taylor (1824) mentions kyanite found along what seems is now state Route 151:

Kyanite, from a new locality in Chatham.
The specimens which I obtained, were taken from a ledge in the turnpike road, leading from Middletown to Middle Haddam, a few rods east of Mr. Asher Rowley's. The crystals are imbedded in quartz, and cross each other in every direction. Their colour is generally a pale blue, with occasional spots of deep blue.

Mineral List

Mineral list contains entries from the region specified including sub-localities

5 entries listed. 5 valid minerals.

Localities in this Region

  • Connecticut

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.


Taylor, Steuben. (1824), Miscellaneous localities of minerals. American Journal of Science: s. 1, 7: 253-4.

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