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Unnamed magnetite occurrences, Higganum, Haddam, Middlesex Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 29' 56'' North , 72° 33' 20'' West
Latitude & Longitude (decimal): 41.49889,-72.55583
Köppen climate type:Cfa : Humid subtropical climate

Numerous small, common, unzoned pegmatites with pink to reddish microcline cross-cut the Pond Meadow gneiss portion of what was called the Monson gneiss in the Higganum area. Natural and man-made exposures are too numerous to list. Some of these pegmatites contain magnetite crytals, but little else of interest. The crystals are octahedral to dodecahedral and deeply striated and can reach 2 to 3 cm.

Davis (1901) states that magnetite:

...occurs in octahedrons with truncated edges, on the summit of a hill on Crook’s Lane, Walkley Hill district, about one mile from the [old Middlesex County] turnpike. These crystals are quite abundant here and well formed, varying in size from ¼ to 1 ¼ inches. Magnetite is also met with in other parts of the town in ledges and boulders, but this locality is by far the most prolific.

They have been noted by Foye (1922) in Higganum Creek west of Depot Road:

In the bed of the brook north of the village of Higganum (Locality 14) well formed magnetite crystals occur in red pegmatite in the Haddam [Monson] gneiss. The occurrence is only interesting in that such perfect crystals of magnetite are rare in the district.

and by Williams (1945) on Ladderpole Hill between Higganum and Haddam center (an area similar to that described by Davis (1901)).

Map reference coordinates are for the Higganum Creek locality.

Mineral List

6 valid minerals.

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

Middle Ordovician - Early Ordovician
458.4 - 485.4 Ma

ID: 3017559
Monson Gneiss

Age: Ordovician (458.4 - 485.4 Ma)

Stratigraphic Name: Monson Gneiss

Description: (May be equivalent to part of Waterford Group) - Interlayered light to dark, mostly medium to coarse-grained gneiss and amphibolite; gneiss composed of plagioclase, quartz, and biotite, with hornblende in some layers and microcline in others; traces of garnet, epidote, and magnetite.

Comments: Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Bronson Hill Anticlinorium. Swanzey, Pauchaug, Monson, and Fourmile Gneisses represent metamorphosed intrusive igneous rocks and yield ages from 454 to 442+3/-2 Ma. Therefore, ages range from early Late through latest Ordovician. Authors suggest that they represent the plutonic root of a calc-alkaline magmatic arc at least 250 km long that was produced partly or entirely on a continental margin in the Late Ordovician. The overlying Ammonoosuc Volcanics and Partridge Formation, rather that resting unconformably on these plagioclase-rich plutonic gneiss, are now known to have had a magmatic history overlapping with them and are approximately the same age (Tucker and Robinson, 1990) per CT012.

Lithology: Major:{gneiss,amphibolite}

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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Davis, James W. (1901), The Minerals of Haddam, Conn. Mineral Collector, v. 8, no. 4, pp. 50-54, and no. 5, pp. 65-70.
Foye, Wilbur G. (1922), Mineral localities in the vicinity of Middletown. American Mineralogist v. 7, p. 4-12.
Rice, William N. and Wilbur G. Foye. (1927), Guide to the Geology of Middletown, Connecticut, And Vicinity. State Geological and Natural History Survey, Bulletin no. 41.
Williams, Horace S. (circa 1945), Article for New York Society of Mineralogists. Brainerd Public Library, Haddam, Connecticut.
Stugard, Frederick, Jr. (1958), Pegmatites Of The Middletown Area, Connecticut. USGS Bulletin 1042-Q.

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