Glastonbury, Hartford Co., Connecticut, USA

• Display
  • Standard
  • Detailed
  • By Strunz Category
  • By Dana Category
• Photos
  • Mineral Photos (313)
  • - Full View (176)
  • - Photomicrograph (58)
  • - Stacked Photomicrograph (67)
  • - UV Short Wave (12)
  • Site Photos (22)
  • - Modern Site Photo (20)
  • - Historical Site Photo (2)
  • Miscellaneous Photos (6)
  • - Unidentified Mineral (2)
  • - Lapidary (4)
  • Add Photo
• Maps
  • Map Pages
  • Nearest Localities
• Search
  • Mineral Search
  • Search Google

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: Strüverite Samarskite-(Y) 'Scapolite' Schorl

Sillimanite Spessartine Sphalerite Staurolite Strengite Thorite Titanite Torbernite 'Tourmaline' 'var: Rubellite' Uraninite Uranophane 'Xenotime' Zircon var: Cyrtolite

102 entries listed. 46 valid minerals.

Localities in this Region

USA Connecticut Hartford Co. Glastonbury Brooks Quarry Diamond Lake locality East Glastonbury Brack Gem prospect (Brack prospect) East Glastonbury Quarry (Curtis Quarry) Sunset Quartzite Quarry Hale's Quarry Knob Hill Quarry Paxton Way South Glastonbury Chamberlain Lane

USA Connecticut Hartford Co. Glastonbury South Glastonbury Gas pipeline Griswold Quarry Hollister prospects (Hollister Quarry) Howe #4 Quarry and Eureka Quarries Howe Quarry (Howe #1 Quarry; Huspband Quarry) Husband Quarry John C. Wiarda Quarry Roaring Brook Quarry Simpson Quarry Unnamed prospects Spinelli prospect (Spinelli quarry)