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Route 11 road cuts, Salem, New London Co., Connecticut, USAi
Regional Level Types
Route 11 road cutsGroup of Road Cuttings (Abandoned)
Salem- not defined -
New London Co.County
ConnecticutState
USACountry

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Latitude & Longitude (WGS84): 41° 27' 43'' North , 72° 16' 18'' West
Latitude & Longitude (decimal): 41.46222,-72.27167
GeoHash:G#: drkeg7vqu
Locality type:Group of Road Cuttings (Abandoned) - last checked 2018
Köppen climate type:Cfb : Temperate oceanic climate


Construction began on state Route 11 (originally state Route 85 expressway) in 1966 but was halted due to lack of funding. The finished section north of state Route 82 opened in 1972, the unfinished section south of Route 82 is currently abandoned state property and as of 2016 the state has no plans or funds to develop it.

Extensive road cuts there expose the Hope Valley Alaskite Gneiss with numerous fractures and faults that host typically small, parallel growth quartz crystals, with some corn-cob and quartzoid habit crystals. Small pieces can typically be found in the rubble weathering out of the exposed, steeply dipping fault zones. Amethyst is rare but formed mostly as scepters to 9 cm. Quartz crystallization probably occurred during the early Mesozoic during faulting associated with continental rifting.

Henderson and Haritos (1989) describe their discovery:

The major quartz pocket, source of the finest amethyst specimens and several hundred colorless quartz crystals, was located 7 meters below the top of the island at the intersection of the dominant joint set and a minor fault. The pocket was 0.5 meters wide, 0.7 meters high and about 1.5 meters deep. The rock near the quartz stringers and pockets was kaolinized. The only other minerals observed were occasional crystals of plagioclase plus fine-grained chlorite and microcrystals of pale purple fluorite.

Regions containing this locality

North America Plate

Plate - 4,949 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Henderson, William A., Jr, and Michael Haritos. (1989), Amethyst Scepters, Salem, New London County, Connecticut. Rocks & Minerals: 64(6).
'Chlorite Group'
Description: fine-grained pocket filling
Reference: Henderson and Haritos (1989)
Fluorite
Formula: CaF2
Colour: pale purple
Description: micro crystals
Reference: Henderson, William A., Jr, and Michael Haritos. (1989), Amethyst Scepters, Salem, New London County, Connecticut. Rocks & Minerals: 64(6).
Molybdenite
Formula: MoS2
Habit: anhedral
Colour: metallic
Description: Small flakes with pyrite in vein in gneiss.
Reference: Former Ed Force collection
Pyrite
Formula: FeS2
Habit: grains
Description: With molybdenite in vein in gneiss.
Reference: Former Ed Force collection
Quartz
Formula: SiO2
Habit: elongated prismatic with rhombohedral terminations, quartzoid, scepter overgrowths
Colour: colorless to white, smoky, purple
Description: Typically parallel growth crystals 1-2 cm long, quartzoids to 1.5 cm, scepter overgrowths to 9 cm.
Reference: A. Berluti collection; Henderson, William A., Jr, and Michael Haritos. (1989), Amethyst Scepters, Salem, New London County, Connecticut. Rocks & Minerals: 64(6).
Quartz var: Agate
Habit: bortyoidal
Colour: orange
Description: A thin layer formed between two generations of quartz crystal growth on some specimens.
Reference: Harold Moritz collection
Quartz var: Amethyst
Formula: SiO2
Habit: scepters
Colour: purple
Description: hoppered, complex scepters on milky quartz to 9 cm
Reference: Mickey Marks Collection; Henderson and Haritos (1989)
Quartz var: Chalcedony
Formula: SiO2
Habit: bortyoidal
Colour: orange
Description: A thin layer formed between two generations of quartz crystal growth on some specimens.
Reference: Harold Moritz collection

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var: Agate4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Unclassified Minerals, Rocks, etc.
Chlorite Group-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
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)
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
Quartz
var: Agate
-SiO2
var: Amethyst-SiO2
var: Chalcedony-SiO2

List of minerals for each chemical element

OOxygen
O AlbiteNa(AlSi3O8)
O Quartz (var: Amethyst)SiO2
O Quartz (var: Chalcedony)SiO2
O QuartzSiO2
FFluorine
F FluoriteCaF2
NaSodium
Na AlbiteNa(AlSi3O8)
AlAluminium
Al AlbiteNa(AlSi3O8)
SiSilicon
Si AlbiteNa(AlSi3O8)
Si Quartz (var: Amethyst)SiO2
Si Quartz (var: Chalcedony)SiO2
Si QuartzSiO2
SSulfur
S MolybdeniteMoS2
S PyriteFeS2
CaCalcium
Ca FluoriteCaF2
FeIron
Fe PyriteFeS2
MoMolybdenum
Mo MolybdeniteMoS2

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

Neoproterozoic
541 - 1000 Ma



ID: 3186948
Neoproterozoic crystalline metamorphic rocks

Age: Neoproterozoic (541 - 1000 Ma)

Lithology: Orthogneiss/paragneiss/metavolcanic gneiss

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]

Neoproterozoic
541 - 1000 Ma



ID: 2789677
Hope Valley Alaskite Gneiss

Age: Neoproterozoic (541 - 1000 Ma)

Stratigraphic Name: Hope Valley Alaskite Gneiss

Description: Light-pink to gray, medium- to coarse-grained, locally porphyritic, variably lineated and foliated alaskitic gneiss, composed of microcline, quartz, albite or oligoclase, and minor magnetite, and locally biotite and muscovite. Lineation formed by rods of quartz. Locally contains quartz-sillimanite nodules.

Comments: Part of Eastern Uplands; Avalonian (Continental) Terrane; Avalonian Anticlinorium; Sterling Plutonic Group (Proterozoic Z?). Isotopic age of 630 Ma by U/Pb methods on zircon is reported by Zartman and Naylor (1984) from a sample in MA. Age of 601 +/-5 Ma by U/Pb methods on zircon is reported by Hermes and Zartman (1985) from a sample in RI (Wones and Goldsmith, 1991) per CT015. 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:{gneiss}

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Henderson, William A., Jr, and Michael Haritos. (1989), Amethyst Scepters, Salem, New London County, Connecticut. Rocks & Minerals: 64(6).
Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407.


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