A town on the east side of the Connecticut River, just southeast of Hartford. The bedrock geology consists of continental clastic sedimentary rocks (Portland Formation) within the Mesozoic Hartford Basin under the westernmost part of town, though these are mostly covered by Pleistocene deposits, and, in the Eastern Highlands, metamorphic rocks of the Bronson Hill terrane under the eastern part of the town. Most of the Bronson Hill bedrock is the Ordovician Glastonbury meta-plutonic gneiss, flanked on the east and west by Collins Hill formation, and unconformably overlain by the Silurian-Devonian meta-sedimentary Fitch, Clough, and Littleton formations in a north-northeast trending syncline near the eastern edge of town. Numerous pegmatites intrude these units, most notably just south of the village of South Glastonbury near the Portland line. This swarm is the northern part of the Middletown Pegmatite District.
The diversity of mineralogy found within the town is dominated by the pegmatites, which include both common and mariolitic, lithium-rich types. Rock forming and accessory metamorphic minerals are found in the meta-plutons and meta-sediments, and low temperature hydrothermal minerals are found in later faults and fractures.
Coordinates are for the town center green.
Mineral ListMineral list contains entries from the region specified including sub-localities
102 entries listed. 46 valid minerals.
Localities in this Region
The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.
This page is currently not sponsored. To sponsor this page click here.
|Fade toolbar when not in focus||Fix toolbar to bottom of page|
|Hide Social Media Links|
|Slideshow frame delay||seconds|