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Unnamed magnetite occurrences, Higganum, Haddam, Middlesex Co., Connecticut, USAi
Regional Level Types
Unnamed magnetite occurrencesGroup of Occurrences
Higganum- not defined -
Haddam- not defined -
Middlesex Co.County
ConnecticutState
USACountry

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Key
Latitude & Longitude (WGS84):
41° 29' 56'' North , 72° 33' 20'' West
Latitude & Longitude (decimal):
Locality type:
Group of Occurrences
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Higganum1,698 (2017)0.2km
Moodus1,413 (2017)8.8km
East Haddam9,042 (2017)9.4km
East Hampton2,691 (2017)9.6km
Middletown46,756 (2017)10.6km


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.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


6 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Colour: white to tan
Description: By sampling and analyzing many pegmatites in the Middletown district, Stugard (1958) established that the plagioclase in them is albite.
Reference: Stugard (1958)
Annite
Formula: KFe2+3(AlSi3O10)(OH)2
Colour: black
Description: fka biotite
Reference: Harold Moritz collection
Magnetite
Formula: Fe2+Fe3+2O4
Habit: Striated octahedrons to dodecahedrons
Colour: metallic gray to black
Description: Typically coated with a thin layer of muscovite that can be carefully removed.
Reference: Foye (1922); Rice and Foye (1927); Williams (circa 1945)
Microcline
Formula: K(AlSi3O8)
Colour: pink to reddish
Description: By sampling and analyzing many pegmatites in the Middletown district, Stugard (1958) established that the K-feldspar in them is microcline.
Reference: Stugard (1958)
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Colour: silvery
Description: Typically coats the magnetite crystals.
Reference: Harold Moritz collection
Quartz
Formula: SiO2
Colour: gray
Reference: Harold Moritz collection
Quartz var: Smoky Quartz
Formula: SiO2
Colour: gray
Reference: Harold Moritz collection

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Annite9.EC.20KFe2+3(AlSi3O10)(OH)2
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2

List of minerals arranged by Dana 8th Edition classification

Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Annite71.2.2b.3KFe2+3(AlSi3O10)(OH)2
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Quartz
var: Smoky Quartz
-SiO2

List of minerals for each chemical element

HHydrogen
H MuscoviteKAl2(AlSi3O10)(OH)2
H AnniteKFe32+(AlSi3O10)(OH)2
OOxygen
O MagnetiteFe2+Fe23+O4
O MuscoviteKAl2(AlSi3O10)(OH)2
O AnniteKFe32+(AlSi3O10)(OH)2
O MicroclineK(AlSi3O8)
O AlbiteNa(AlSi3O8)
O Quartz (var: Smoky Quartz)SiO2
O QuartzSiO2
NaSodium
Na AlbiteNa(AlSi3O8)
AlAluminium
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al AnniteKFe32+(AlSi3O10)(OH)2
Al MicroclineK(AlSi3O8)
Al AlbiteNa(AlSi3O8)
SiSilicon
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si AnniteKFe32+(AlSi3O10)(OH)2
Si MicroclineK(AlSi3O8)
Si AlbiteNa(AlSi3O8)
Si Quartz (var: Smoky Quartz)SiO2
Si QuartzSiO2
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K AnniteKFe32+(AlSi3O10)(OH)2
K MicroclineK(AlSi3O8)
FeIron
Fe MagnetiteFe2+Fe23+O4
Fe AnniteKFe32+(AlSi3O10)(OH)2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
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.

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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