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State Forest Quarry No. 1 (State Forest #1 Quarry; Clark Hill Quarry), East Hampton (Chatham), Middlesex Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 35' 43'' North , 72° 32' 28'' West
Latitude & Longitude (decimal): 41.59528,-72.54111
GeoHash:G#: drkktk1nj
Locality type:Quarry
Köppen climate type:Dfa : Hot-summer humid continental climate


The main details about this granite pegmatite quarry are given by Cameron et al (1954):

The State Forest No. 1 quarry lies in the town of East Hampton, 2.3 miles N. 55° W. of the center of East Hampton village...

The property is owned by the State of Connecticut and is administered by the Forestry Department, State Office Building, Hartford. The New Haven Trap Rock Co., 67 Church Street, New Haven, quarried the pegmatite in October and November 1942, and the Worth Spar Co., Inc., Cobalt, operated the deposit for 3 months in the summer of 1943. The workings consist of an opencut about 90 feet long, 40 feet wide and 15 feet deep. E. N. Cameron examined the property in November 1942.

At the time of examination, the pegmatite was so poorly exposed that its form, attitude and extent could not be determined. Probably it strikes north-northeast. At the entrance to the quarry, and on the east side of the cut, pegmatite is exposed in irregular cross­cutting contact with quartz-mica schists. However, it is not certain whether the schists are the true walls of the pegmatite or merely inclusions in it.

The pegmatite is composed chiefly of coarse-grained quartz and plagioclase, intergrown in various proportions. Muscovite, garnet, tourmaline, and beryl are also present. Pods of [microcline] perthite and of quartz and [microcline] perthite as much as 4 feet long and 2 feet wide are irregularly distributed through the pegmatite.

Mica books 2 to 15 inches in diameter and 3/4 to 4 inches thick are present in the pegmatite. At the time of examination, however, the quarry walls were obscured to such an extent that the distribution of the mica could not be determined satisfactorily. According to the quarrymen, most of the mica mined in 1942 was associated with a pod of coarse-grained quartz and [microcline] perthite.

The mica is a clear, light rum, moderately hard, free-splitting muscovite. Most books are free of inclusions, but some contain garnet and plagioclase crystals. All the books are more or less marred by “A” structure, ruling, and cross-fracturing, and many books are wedge-shaped. Beryl occurs as crystals 1 to 8 inches in length and 1/2 to 5 inches in diameter.
Mica was found associated with one or more pods, and scattered books of mica occur elsewhere in the pegmatite. The average percentage of crude mica recovered from rock mined was very low, however. Neither of the attempts made to mine the deposit in 1942 and 1943 was successful.
(Cameron)

Scheelite is reported in the literature as occurring here, but the report almost certainly results from confusion with the Worth Quarry that was also operated by the Worth Spar Co. on Hog Hill near Middle Haddam where scheelite was found.

Collecting is allowed via permit issued by the Connecticut DEEP to educational organizations (schools, mineral clubs, etc.). See link below.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


14 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Habit: short, feathery aggregates lining rare pockets, otherwise massive
Colour: white to cream
Description: Stugard (1958) sampled and analyzed many pegmatites in the district (though not this one) and found the plagioclase to have only 3 to 7 percent anorthite. Rare pockets are lined with subparallel, chisel-tipped (feathery) crystal aggregates.
Reference: Stugard, Frederick, Jr. (1958). Pegmatites of the Middletown Area Connecticut. USGS Bulletin 1042-Q.; Cameron, Eugene N., David M. Larrabee, Andrew H. McNair, James T. Page, Glenn W. Stewart, and Vincent E. Shainin. (1954): Pegmatite Investigations 1942-45 New England. USGS Professional Paper 255.; Harold Moritz collection.
Almandine
Formula: Fe2+3Al2(SiO4)3
Habit: trapezohedral
Colour: red-brown
Description: XRF analyses by Harold Moritz indicate almandine with a spessartine component, which is typical of garnets in the district's pegmatites.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 403.; Harold Moritz collection.
Annite
Formula: KFe2+3(AlSi3O10)(OH)2
Habit: elongated subhedral tabular
Colour: black
Description: fka biotite, Long (up to several dm) tabular crystals are abundant in the graphic granite zone, which makes up most of the dump material and is barren of other minerals. Groups of a few crystals typically radiate from a point.
Reference: Harold Moritz collection
Beryl
Formula: Be3Al2(Si6O18)
Habit: generally stubby to elongated hexagonal prisms, poorly terminated, except in pockets (rare).
Colour: aqua, pale green, yellow
Description: Beryl occurs as mostly subhedral matrix crystals 1 to 8 inches in length and 1/2 to 5 inches in diameter. But euhedral, gemmy aquamarines rarely occur in pockets.
Reference: [www.johnbetts-fineminerals.com]; Cameron, Eugene N., David M. Larrabee, Andrew H. McNair, James T. Page, Glenn W. Stewart, and Vincent E. Shainin. (1954): Pegmatite Investigations 1942-45 New England. USGS Professional Paper 255.; Harold Moritz collection; Jeff Fast collection
Columbite-(Fe)
Formula: FeNb2O6
Habit: elongated prisms to anhedral grains
Colour: black with iridescence
Description: Mostly small crystals <1 cm in albite, could be more common but hard to detect with the abundance annite and schorl.
Reference: Harold Moritz collection
'Feldspar Group'
Description: see details under "microcline"
Reference: Cameron, Eugene N., David M. Larrabee, Andrew H. McNair, James T. Page, Glenn W. Stewart, and Vincent E. Shainin. (1954): Pegmatite Investigations 1942-45 New England. USGS Professional Paper 255.
'Feldspar Group var: Perthite'
Description: see details under "microcline"
Reference: Cameron, Eugene N., David M. Larrabee, Andrew H. McNair, James T. Page, Glenn W. Stewart, and Vincent E. Shainin. (1954): Pegmatite Investigations 1942-45 New England. USGS Professional Paper 255.
Goethite
Formula: α-Fe3+O(OH)
Reference: P. Cristofono collection, 2013
Hematite
Formula: Fe2O3
Reference: P. Cristofono collection, 2013
Microcline
Formula: K(AlSi3O8)
Habit: elongated prisms rare from pockets, otherwise large equant crystals in quartz core pods and cleavable masses
Colour: white to cream
Description: Stugard (1958) sampled and analyzed many pegmatites in the district (though not this one) and reports that the pethite in the district is microcline hosting albite. Large equant crystals 50-60 cm exposed along the boundaries of quartz core "pods". Crystals to several cm rarely found in pockets and these are typically etched.
Reference: Cameron, Eugene N., David M. Larrabee, Andrew H. McNair, James T. Page, Glenn W. Stewart, and Vincent E. Shainin. (1954): Pegmatite Investigations 1942-45 New England. USGS Professional Paper 255.; Stugard, Frederick, Jr. (1958): Pegmatites of the Middletown Area, Connecticut. USGS Bulletin 1042-Q.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Habit: tabular, mostly subhedral
Colour: silver to rum
Description: Besides subhedral material in the pegmatite matrix, mostly found around the edges of quartz core "pods" where they can be subhedral and up to 7-8 cm and 1-2 cm thick, rarely found as euhedral, thicker books in pockets.
Reference: P Cristofono collection, 2007; Cameron, Eugene N., David M. Larrabee, Andrew H. McNair, James T. Page, Glenn W. Stewart, and Vincent E. Shainin. (1954): Pegmatite Investigations 1942-45 New England. USGS Professional Paper 255.
Quartz
Formula: SiO2
Colour: clear, white, smoky
Description: Mostly massive as part of the pegmatite matrix. Excellent crystals to several cm are rarely found in pockets.
Reference: P Cristofono collection, 2007; Cameron, Eugene N., David M. Larrabee, Andrew H. McNair, James T. Page, Glenn W. Stewart, and Vincent E. Shainin. (1954): Pegmatite Investigations 1942-45 New England. USGS Professional Paper 255.; David Busha collection
Quartz var: Rose Quartz
Formula: SiO2
Habit: massive
Colour: pale rose
Description: Massive material very rare.
Reference: David Hanson collection
Quartz var: Smoky Quartz
Formula: SiO2
Habit: trigonal pocket crystals rare, mostly massive
Colour: smoky
Description: Abundant as massive pegmatite matrix component. Crystals rarely found in pockets can be several cm long.
Reference: Van King
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Habit: stubby to elongated prisms, mostly subhedral in matrix
Colour: black
Description: Poor crystals to 15-20 cm in matrix. The best crystals to several cm occur in the pocket zone.
Reference: P Cristofono collection, 2007; Harold Moritz collection; Jeff Fast collection; Cameron, Eugene N., David M. Larrabee, Andrew H. McNair, James T. Page, Glenn W. Stewart, and Vincent E. Shainin. (1954): Pegmatite Investigations 1942-45 New England. USGS Professional Paper 255.
Spessartine ?
Formula: Mn2+3Al2(SiO4)3
Description: Listed based upon speculation, XRF analyses of pegmatitic garnets show mostly impure almandine.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 403.
Torbernite
Formula: Cu(UO2)2(PO4)2 · 12H2O
Reference: Schooner, Richard. (1958): The Mineralogy of the Portland-East Hampton-Middletown-Haddam Area in Connecticut (With a few notes on Glastonbury and Marlborough). Published by Richard Schooner; Ralph Lieser of Pappy’s Beryl Shop, East Hampton; and Howard Pate of Fluorescent House, Branford, Connecticut.
'Tourmalinated Quartz'
Reference: David Busha collection
Uraninite
Formula: UO2
Reference: Schooner, Richard. (1958): The Mineralogy of the Portland-East Hampton-Middletown-Haddam Area in Connecticut (With a few notes on Glastonbury and Marlborough). Published by Richard Schooner; Ralph Lieser of Pappy’s Beryl Shop, East Hampton; and Howard Pate of Fluorescent House, Branford, Connecticut.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Columbite-(Fe)'4.DB.35FeNb2O6
'Goethite'4.00.α-Fe3+O(OH)
'Hematite'4.CB.05Fe2O3
'Quartz'4.DA.05SiO2
var: Rose Quartz4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Uraninite4.DL.05UO2
Group 8 - Phosphates, Arsenates and Vanadates
Torbernite8.EB.05Cu(UO2)2(PO4)2 · 12H2O
Group 9 - Silicates
'Albite'9.FA.35Na(AlSi3O8)
'Almandine'9.AD.25Fe2+3Al2(SiO4)3
'Annite'9.EC.20KFe2+3(AlSi3O10)(OH)2
'Beryl'9.CJ.05Be3Al2(Si6O18)
'Microcline'9.FA.30K(AlSi3O8)
'Muscovite'9.EC.15KAl2(AlSi3O10)(OH)2
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Spessartine ?9.AD.25Mn2+3Al2(SiO4)3
Unclassified Minerals, Rocks, etc.
'Feldspar Group'-
'var: Perthite'-
Tourmalinated Quartz-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
AB2O6
Columbite-(Fe)8.3.2.2FeNb2O6
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
AB2(XO4)2·xH2O, containing (UO2)2+
Torbernite40.2a.13.1Cu(UO2)2(PO4)2 · 12H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Spessartine ?51.4.3a.3Mn2+3Al2(SiO4)3
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
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, Rocks, etc.
'Feldspar Group'-
'var: Perthite'-
Quartz
var: Rose Quartz
-SiO2
var: Smoky Quartz-SiO2
'Tourmalinated Quartz'-

List of minerals for each chemical element

HHydrogen
H AnniteKFe32+(AlSi3O10)(OH)2
H Goethiteα-Fe3+O(OH)
H MuscoviteKAl2(AlSi3O10)(OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H TorberniteCu(UO2)2(PO4)2 · 12H2O
BeBeryllium
Be BerylBe3Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O AlbiteNa(AlSi3O8)
O AlmandineFe32+Al2(SiO4)3
O AnniteKFe32+(AlSi3O10)(OH)2
O BerylBe3Al2(Si6O18)
O Columbite-(Fe)FeNb2O6
O Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O MicroclineK(AlSi3O8)
O MuscoviteKAl2(AlSi3O10)(OH)2
O QuartzSiO2
O Quartz (var: Rose Quartz)SiO2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Quartz (var: Smoky Quartz)SiO2
O SpessartineMn32+Al2(SiO4)3
O TorberniteCu(UO2)2(PO4)2 · 12H2O
O UraniniteUO2
NaSodium
Na AlbiteNa(AlSi3O8)
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Al AlbiteNa(AlSi3O8)
Al AlmandineFe32+Al2(SiO4)3
Al AnniteKFe32+(AlSi3O10)(OH)2
Al BerylBe3Al2(Si6O18)
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al SpessartineMn32+Al2(SiO4)3
SiSilicon
Si AlbiteNa(AlSi3O8)
Si AlmandineFe32+Al2(SiO4)3
Si AnniteKFe32+(AlSi3O10)(OH)2
Si BerylBe3Al2(Si6O18)
Si MicroclineK(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si Quartz (var: Rose Quartz)SiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Quartz (var: Smoky Quartz)SiO2
Si SpessartineMn32+Al2(SiO4)3
PPhosphorus
P TorberniteCu(UO2)2(PO4)2 · 12H2O
KPotassium
K AnniteKFe32+(AlSi3O10)(OH)2
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
MnManganese
Mn SpessartineMn32+Al2(SiO4)3
FeIron
Fe AlmandineFe32+Al2(SiO4)3
Fe AnniteKFe32+(AlSi3O10)(OH)2
Fe Columbite-(Fe)FeNb2O6
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
CuCopper
Cu TorberniteCu(UO2)2(PO4)2 · 12H2O
NbNiobium
Nb Columbite-(Fe)FeNb2O6
UUranium
U TorberniteCu(UO2)2(PO4)2 · 12H2O
U UraniniteUO2

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 Macrostrat.org

Devonian
358.9 - 419.2 Ma



ID: 2920849
Littleton Formation

Age: Devonian (358.9 - 419.2 Ma)

Stratigraphic Name: Littleton Formation

Description: Gray to silvery, generally non-rusty, medium-grained, massive to well-layered alternating schist and micaceous quartzite, composed of quartz, muscovite, biotite, garnet, and oligoclase, also staurolite, graphite, and ilmenite, and in certain areas kyanite or sillimanite in schist.

Comments: Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Bronson Hill Anticlinorium; Bolton Group (Devonian and Silurian) Original map source: Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2000, Bedrock Geology of Connecticut, shapefile, scale 1:50,000

Lithology: Major:{schist,quartzite}

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]

Devonian - Silurian
358.9 - 443.8 Ma



ID: 3186140
Paleozoic sedimentary and volcanic rocks

Age: Paleozoic (358.9 - 443.8 Ma)

Lithology: Mudstone-carbonate-sandstone-conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Cameron, Eugene N., David M. Larrabee, Andrew H. McNair, James T. Page, Glenn W. Stewart, and Vincent E. Shainin. (1954): Pegmatite Investigations 1942-45 New England. USGS Professional Paper 255.
Schooner, Richard. (1958): The Mineralogy of the Portland-East Hampton-Middletown-Haddam Area in Connecticut (With a few notes on Glastonbury and Marlborough). Published by Richard Schooner; Ralph Lieser of Pappy’s Beryl Shop, East Hampton; and Howard Pate of Fluorescent House, Branford, Connecticut.
Stugard, Frederick, Jr. (1958): Pegmatites of the Middletown Area, Connecticut. USGS Bulletin 1042-Q.
Jones, Robert W. (1960): Luminescent Minerals of Connecticut, A Guide To Their Properties and Locations.
Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Ryerson, Kathleen. (1972): Rock Hound's Guide to Connecticut. Pequot Press.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 403.

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