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Glastonbury, Hartford Co., Connecticut, USA
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Latitude: 41°42'44"N
Longitude: 72°36'29"W
 
 
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 List

Mineral list contains entries from the region specified including sub-localities
Albite
var: Cleavelandite
Almandine
Annite
Autunite
Beryl
var: Aquamarine
var: Goshenite
var: Heliodor
var: Morganite
Bismutite
Cassiterite
Chalcopyrite
'Columbite'
Columbite-(Fe)
'Columbite-Tantalite'
Cookeite
Dickite
Dravite
Elbaite
Epidote
Ferrimolybdite
Fluorapatite
var: Mn-bearing Fluorapatite
Fluorite
var: Chlorophane
Gahnite
'Garnet'
Grayite
Kaolinite
Lepidolite
Magnetite
Meta-autunite
Metatorbernite
Microcline
var: Amazonite
Microlite Group
Molybdenite
'Monazite'
Monazite-(Ce)
Muscovite
Nacrite ?
Opal
var: Opal-AN

Orthoclase
Pyrite
Quartz
var: Smoky Quartz
Rutile
var: StrĂ¼verite

Samarskite-(Y)
'Scapolite'
Schorl
Sillimanite
Spessartine
Sphalerite
Staurolite
Strengite
Thorite
Titanite
Torbernite
'Tourmaline'
'var: Rubellite'
Uraninite
Uranophane
'Xenotime'
Zircon
var: Cyrtolite


103 entries listed. 46 valid minerals.

Localities in this Region

USA
USA

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: April 17, 2014 00:58:23 Page generated: April 11, 2014 23:36:08
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