Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

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

This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
41° 29' 56'' North , 72° 33' 20'' West
Latitude & Longitude (decimal):
Locality type:
Group of Occurrences
Köppen climate type:
Nearest Settlements:
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:

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)
Formula: KFe2+3(AlSi3O10)(OH)2
Colour: black
Description: fka biotite
Reference: Harold Moritz collection
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)
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)
Formula: KAl2(AlSi3O10)(OH)2
Colour: silvery
Description: Typically coats the magnetite crystals.
Reference: Harold Moritz collection
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
var: Smoky Quartz4.DA.05SiO2
Group 9 - Silicates

List of minerals arranged by Dana 8th Edition classification

Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Unclassified Minerals, Mixtures, etc.
var: Smoky Quartz

List of minerals for each chemical element

H MuscoviteKAl2(AlSi3O10)(OH)2
H AnniteKFe32+(AlSi3O10)(OH)2
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
Na AlbiteNa(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al AnniteKFe32+(AlSi3O10)(OH)2
Al MicroclineK(AlSi3O8)
Al AlbiteNa(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si AnniteKFe32+(AlSi3O10)(OH)2
Si MicroclineK(AlSi3O8)
Si AlbiteNa(AlSi3O8)
Si Quartz (var: Smoky Quartz)SiO2
Si QuartzSiO2
K MuscoviteKAl2(AlSi3O10)(OH)2
K AnniteKFe32+(AlSi3O10)(OH)2
K MicroclineK(AlSi3O8)
Fe MagnetiteFe2+Fe23+O4
Fe AnniteKFe32+(AlSi3O10)(OH)2


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

This page 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.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2020, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: February 28, 2020 12:43:56 Page generated: January 19, 2020 02:43:27
Go to top of page