State Forest Quarry No. 1 (State Forest #1 Quarry; Clark Hill Quarry), East Hampton (Chatham), Middlesex County, Connecticut, USAi
| Regional Level Types | |
|---|---|
| State Forest Quarry No. 1 (State Forest #1 Quarry; Clark Hill Quarry) | Quarry |
| East Hampton (Chatham) | Quarry |
| Middlesex County | County |
| Connecticut | State |
| USA | Country |
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Latitude & Longitude (WGS84):
41° 35' 44'' North , 72° 32' 27'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Lake Pocotopaug | 3,436 (2017) | 2.6km |
| East Hampton | 2,691 (2017) | 3.9km |
| Terramuggus | 1,025 (2017) | 7.3km |
| Portland | 5,862 (2017) | 8.7km |
| Cromwell | 13,750 (2017) | 8.7km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Lapidary and Mineral Society of Central Connecticut | Meriden, Connecticut | 23km |
| Bristol Gem & Mineral Club | Bristol, Connecticut | 35km |
| New Haven Mineral Club | New Haven, Connecticut | 45km |
Mindat Locality ID:
9660
Long-form identifier:
mindat:1:2:9660:0
GUID (UUID V4):
a979a08b-f5c8-411d-88cf-7b3fac774f00
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. 55Β° 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 crossΒcutting 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 βAβ 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 Gallery Strunz Chemical ElementsDetailed Mineral List:
| β 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. References: |
| β 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. |
| β 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. References: |
| βͺ 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. |
| β Columbite-(Fe) Formula: Fe2+Nb2O6 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. References: |
| β Cookeite Formula: (LiAl4◻)[AlSi3O10](OH)8 Habit: globular aggregates of tabular crystals Colour: yellow-white Description: mm-sized globular crystal aggregates, one find so far (2021). References: |
| β 'Feldspar Group' Description: see details under "microcline" |
| β 'Feldspar Group var. Perthite' Description: see details under "microcline" |
| β Goethite Formula: Ξ±-Fe3+O(OH) References: |
| β Hematite Formula: Fe2O3 References: |
| β 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, pinkish 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. |
| β 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. |
| β 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. |
| β Quartz var. Rose Quartz Formula: SiO2 Habit: massive Colour: pale rose Description: Massive material very rare. References: |
| β 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. References: |
| β Schorl Formula: NaFe2+3Al6(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. |
| β Formula: Mn2+3Al2(SiO4)3 Description: Listed based upon speculation, XRF analyses of pegmatitic garnets show mostly impure almandine. |
| β Torbernite Formula: Cu(UO2)2(PO4)2 · 12H2O References: |
| β 'Tourmalinated Quartz' References: |
| β Uraninite Formula: UO2 References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| β | Goethite | 4.00. | Ξ±-Fe3+O(OH) |
| β | Hematite | 4.CB.05 | Fe2O3 |
| β | Quartz | 4.DA.05 | SiO2 |
| β | var. Rose Quartz | 4.DA.05 | SiO2 |
| β | var. Smoky Quartz | 4.DA.05 | SiO2 |
| β | Columbite-(Fe) | 4.DB.35 | Fe2+Nb2O6 |
| β | Uraninite | 4.DL.05 | UO2 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| β | Torbernite | 8.EB.05 | Cu(UO2)2(PO4)2 Β· 12H2O |
| Group 9 - Silicates | |||
| β | Almandine | 9.AD.25 | Fe2+3Al2(SiO4)3 |
| β | Spessartine ? | 9.AD.25 | Mn2+3Al2(SiO4)3 |
| β | Beryl | 9.CJ.05 | Be3Al2(Si6O18) |
| β | Schorl | 9.CK.05 | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| β | Annite | 9.EC.20 | KFe2+3(AlSi3O10)(OH)2 |
| β | Cookeite | 9.EC.55 | (LiAl4β»)[AlSi3O10](OH)8 |
| β | Microcline | 9.FA.30 | K(AlSi3O8) |
| β | Albite | 9.FA.35 | Na(AlSi3O8) |
| Unclassified | |||
| β | 'Feldspar Group' | - | |
| β | 'var. Perthite' | - | |
| β | 'Tourmalinated Quartz' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | β Annite | KFe32+(AlSi3O10)(OH)2 |
| H | β Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| H | β Goethite | Ξ±-Fe3+O(OH) |
| H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| H | β Torbernite | Cu(UO2)2(PO4)2 · 12H2O |
| Li | Lithium | |
| Li | β Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| Be | Beryllium | |
| Be | β Beryl | Be3Al2(Si6O18) |
| B | Boron | |
| B | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | Oxygen | |
| O | β Albite | Na(AlSi3O8) |
| O | β Annite | KFe32+(AlSi3O10)(OH)2 |
| O | β Almandine | Fe32+Al2(SiO4)3 |
| O | β Beryl | Be3Al2(Si6O18) |
| O | β Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| O | β Columbite-(Fe) | Fe2+Nb2O6 |
| O | β Goethite | Ξ±-Fe3+O(OH) |
| O | β Hematite | Fe2O3 |
| O | β Microcline | K(AlSi3O8) |
| O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | β Quartz | SiO2 |
| O | β Quartz var. Rose Quartz | SiO2 |
| O | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | β Quartz var. Smoky Quartz | SiO2 |
| O | β Spessartine | Mn32+Al2(SiO4)3 |
| O | β Torbernite | Cu(UO2)2(PO4)2 · 12H2O |
| O | β Uraninite | UO2 |
| Na | Sodium | |
| Na | β Albite | Na(AlSi3O8) |
| Na | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | Aluminium | |
| Al | β Albite | Na(AlSi3O8) |
| Al | β Annite | KFe32+(AlSi3O10)(OH)2 |
| Al | β Almandine | Fe32+Al2(SiO4)3 |
| Al | β Beryl | Be3Al2(Si6O18) |
| Al | β Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| Al | β Microcline | K(AlSi3O8) |
| Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | β Spessartine | Mn32+Al2(SiO4)3 |
| Si | Silicon | |
| Si | β Albite | Na(AlSi3O8) |
| Si | β Annite | KFe32+(AlSi3O10)(OH)2 |
| Si | β Almandine | Fe32+Al2(SiO4)3 |
| Si | β Beryl | Be3Al2(Si6O18) |
| Si | β Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| Si | β Microcline | K(AlSi3O8) |
| Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | β Quartz | SiO2 |
| Si | β Quartz var. Rose Quartz | SiO2 |
| Si | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | β Quartz var. Smoky Quartz | SiO2 |
| Si | β Spessartine | Mn32+Al2(SiO4)3 |
| P | Phosphorus | |
| P | β Torbernite | Cu(UO2)2(PO4)2 · 12H2O |
| K | Potassium | |
| K | β Annite | KFe32+(AlSi3O10)(OH)2 |
| K | β Microcline | K(AlSi3O8) |
| K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| Mn | Manganese | |
| Mn | β Spessartine | Mn32+Al2(SiO4)3 |
| Fe | Iron | |
| Fe | β Annite | KFe32+(AlSi3O10)(OH)2 |
| Fe | β Almandine | Fe32+Al2(SiO4)3 |
| Fe | β Columbite-(Fe) | Fe2+Nb2O6 |
| Fe | β Goethite | Ξ±-Fe3+O(OH) |
| Fe | β Hematite | Fe2O3 |
| Fe | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Cu | Copper | |
| Cu | β Torbernite | Cu(UO2)2(PO4)2 · 12H2O |
| Nb | Niobium | |
| Nb | β Columbite-(Fe) | Fe2+Nb2O6 |
| U | Uranium | |
| U | β Torbernite | Cu(UO2)2(PO4)2 · 12H2O |
| U | β Uraninite | UO2 |
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Ganderia DomainDomain
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References
