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O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Southbury, New Haven Co., Connecticut, USAi
Regional Level Types
O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry)Quarry
Southbury- not defined -
New Haven Co.County
ConnecticutState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84): 41° 30' 50'' North , 73° 12' 57'' West
Latitude & Longitude (decimal): 41.51389,-73.21611
GeoHash:G#: dr7ujvmeu
Locality type:Quarry
Köppen climate type:Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Woodbury9,755 (2017)3.5km
Woodbury Center1,294 (2017)3.5km
Southbury19,836 (2017)3.6km
Heritage Village3,736 (2017)3.6km
Middlebury6,974 (2017)7.5km


Note, the entrance road to this quarry is on State Route 67 in Southbury; however, the quarry starts about 0.5 mile north of the entrance road and the vast majority of it is mostly in Woodbury. Because O & G operates another quarry farther north in Woodbury (O & G No. 1 or the "Woodbury" Quarry), this locality has almost universally been referred to as the "Southbury" Quarry to differentiate it, even though it too is technically in Woodbury. It has been referred to as the Silliman Quarry, but that name initially referred to an earlier sand pit a little to the south. However, Brunet (1977) states that the Silliman family, descended from Yale mineralogist Benjamin Silliman, owned the trap rock quarry, too, at that time.

Collecting field trips were kindly allowed until about 2000 when someone violated the rules, closing the site for all but a few with special permission.

Well known Connecticut locality for prehnite. Three varieties are found - the standard green, rare yellow prehnite, and the extremely rare white prehnite that is almost completely free of iron impurities. Particularly noteworthy are prehnite floater specimens called "hearts". According to Garabedian (1998) these formed via a 5-step process:

1. Chalcedony precipitation on vesicle walls as "fortification" agate.
2. Chalcedony (or partial white, fine-grained, chalky quartz replacement of initial chalcedony) is replaced by fine-grained, white, granular datolite.
3. Prehnite encrusts and/or partly replaces the datolite replacement.
4. Datolite dissolves, leaving a floater of prehnite with large crystals on the inside (small ones may be present on the outside where the datolite was partly replaced by initial prehnite).
5. More prehnite forms on the outside of the prehnite floater, resulting in aggregates with large prehnite crystals on both sides.

Examples of all the intermediate steps can be found in the vesicles.

Other noteworthy pseudomorphing described by Garabedian (1998) include:

- Pumpellyite replacement of chalcedony.
- Tabular anhydrite crystals epimorphed by chalcedony, quartz, a trapezohedral zeolite, or pumpellyite; the anhydrite later dissolves.
- Prehnite or pumpellyite encrust a trapezohedral zeolite (wairakite or analcime), which later dissolves, and more prehnite or pumpellyite partly or completely fill in the void.
- Sequential "water level" vesicle fillings by thin layers of ferroan calcite that are later epimorphed by quartz, chalcedony, datolite or pumpellyite.

Late forming minerals include pyrite, gemmy green sphalerite crystals to about 6mm, calcite as dogteeth or various rhombohedra, apophyllite, babingtonite, julgoldite/pumpellyite, drusy quartz (some amethystine) and zeolites.

Faulting created brecciated zones and cross-cutting veins filled with coarse-grained, columnar, parallel-growth calcite the grew from opposite walls and commonly stained with red, earthy hematite. These veins can reach around 1 meter thick.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


23 valid minerals.

Detailed Mineral List:

Analcime
Formula: Na(AlSi2O6) · H2O
Anhydrite
Formula: CaSO4
'Apophyllite'
Arsenopyrite
Formula: FeAsS
Babingtonite
Formula: Ca2(Fe,Mn)FeSi5O14(OH)
Calcite
Formula: CaCO3
Celadonite
Formula: K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Chabazite-Ca
Formula: (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
'Chlorite Group'
Datolite
Formula: CaB(SiO4)(OH)
Ferrosaponite ?
Formula: Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Fluorapophyllite-(K)
Formula: KCa4(Si8O20)(F,OH) · 8H2O
Galena
Formula: PbS
Goethite
Formula: α-Fe3+O(OH)
Gypsum
Formula: CaSO4 · 2H2O
Gypsum var: Selenite
Formula: CaSO4 · 2H2O
Hematite
Formula: Fe2O3
'Heulandite subgroup'
Julgoldite-(Fe2+)
Formula: Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2O
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Pectolite
Formula: NaCa2Si3O8(OH)
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Pumpellyite-(Mg)
Formula: Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Pyrite
Formula: FeS2
Quartz
Formula: SiO2
Quartz var: Amethyst
Formula: SiO2
Quartz var: Chalcedony
Formula: SiO2
Sphalerite
Formula: ZnS
'Stilbite subgroup'

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anhydrite7.AD.30CaSO4
Gypsum7.CD.40CaSO4 · 2H2O
var: Selenite7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
Analcime9.GB.05Na(AlSi2O6) · H2O
Babingtonite9.DK.05Ca2(Fe,Mn)FeSi5O14(OH)
Celadonite9.EC.15K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Chabazite-Ca9.GD.10(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Datolite9.AJ.20CaB(SiO4)(OH)
Ferrosaponite ?9.EC.45Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Fluorapophyllite-(K)9.EA.15KCa4(Si8O20)(F,OH) · 8H2O
Julgoldite-(Fe2+)9.BG.20Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2O
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Pectolite9.DG.05NaCa2Si3O8(OH)
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Pumpellyite-(Mg)9.BG.20Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Unclassified Minerals, Rocks, etc.
'Apophyllite'-
'Chlorite Group'-
'Heulandite subgroup'-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anhydrite28.3.2.1CaSO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Datolite54.2.1a.1CaB(SiO4)(OH)
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Julgoldite-(Fe2+)58.2.2.1Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2O
Pumpellyite-(Mg)58.2.2.7Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=3
Pectolite65.2.1.4aNaCa2Si3O8(OH)
Single-Width Unbranched Chains, W=1 with chains P=5
Babingtonite65.4.1.2Ca2(Fe,Mn)FeSi5O14(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Celadonite71.2.2a.6K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Prehnite72.1.3.1Ca2Al2Si3O10(OH)2
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
Fluorapophyllite-(K)72.3.1.1KCa4(Si8O20)(F,OH) · 8H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Chabazite-Ca77.1.2.1(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Mixtures, etc.
'Apophyllite'-
'Chlorite Group'-
Ferrosaponite ?-Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Gypsum
var: Selenite
-CaSO4 · 2H2O
'Heulandite subgroup'-
Quartz
var: Amethyst
-SiO2
var: Chalcedony-SiO2
'Stilbite subgroup'-

List of minerals for each chemical element

HHydrogen
H PrehniteCa2Al2Si3O10(OH)2
H Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
H LaumontiteCaAl2Si4O12 · 4H2O
H Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
H Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
H PectoliteNaCa2Si3O8(OH)
H Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
H BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
H AnalcimeNa(AlSi2O6) · H2O
H NatroliteNa2Al2Si3O10 · 2H2O
H Goethiteα-Fe3+O(OH)
H Gypsum (var: Selenite)CaSO4 · 2H2O
H GypsumCaSO4 · 2H2O
H DatoliteCaB(SiO4)(OH)
H CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
H FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
OOxygen
O PrehniteCa2Al2Si3O10(OH)2
O Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
O CalciteCaCO3
O QuartzSiO2
O LaumontiteCaAl2Si4O12 · 4H2O
O Quartz (var: Amethyst)SiO2
O Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
O Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
O Quartz (var: Chalcedony)SiO2
O PectoliteNaCa2Si3O8(OH)
O Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
O BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
O AnalcimeNa(AlSi2O6) · H2O
O NatroliteNa2Al2Si3O10 · 2H2O
O Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O Gypsum (var: Selenite)CaSO4 · 2H2O
O GypsumCaSO4 · 2H2O
O DatoliteCaB(SiO4)(OH)
O CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
O AnhydriteCaSO4
O FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
FFluorine
F Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
NaSodium
Na PectoliteNaCa2Si3O8(OH)
Na AnalcimeNa(AlSi2O6) · H2O
Na NatroliteNa2Al2Si3O10 · 2H2O
MgMagnesium
Mg Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Mg CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Mg FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
AlAluminium
Al PrehniteCa2Al2Si3O10(OH)2
Al LaumontiteCaAl2Si4O12 · 4H2O
Al Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Al Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Al AnalcimeNa(AlSi2O6) · H2O
Al NatroliteNa2Al2Si3O10 · 2H2O
Al FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
SiSilicon
Si PrehniteCa2Al2Si3O10(OH)2
Si Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Si QuartzSiO2
Si LaumontiteCaAl2Si4O12 · 4H2O
Si Quartz (var: Amethyst)SiO2
Si Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
Si Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Si Quartz (var: Chalcedony)SiO2
Si PectoliteNaCa2Si3O8(OH)
Si Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Si BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Si AnalcimeNa(AlSi2O6) · H2O
Si NatroliteNa2Al2Si3O10 · 2H2O
Si DatoliteCaB(SiO4)(OH)
Si CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Si FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
SSulfur
S SphaleriteZnS
S ArsenopyriteFeAsS
S GalenaPbS
S Gypsum (var: Selenite)CaSO4 · 2H2O
S GypsumCaSO4 · 2H2O
S PyriteFeS2
S AnhydriteCaSO4
KPotassium
K Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
K CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
CaCalcium
Ca PrehniteCa2Al2Si3O10(OH)2
Ca Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Ca CalciteCaCO3
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
Ca Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Ca PectoliteNaCa2Si3O8(OH)
Ca Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Ca BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Ca Gypsum (var: Selenite)CaSO4 · 2H2O
Ca GypsumCaSO4 · 2H2O
Ca DatoliteCaB(SiO4)(OH)
Ca AnhydriteCaSO4
Ca FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
MnManganese
Mn BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
FeIron
Fe Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
Fe ArsenopyriteFeAsS
Fe BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
Fe PyriteFeS2
Fe CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Fe FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
ZnZinc
Zn SphaleriteZnS
AsArsenic
As ArsenopyriteFeAsS
PbLead
Pb GalenaPbS

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

Early Jurassic
174.1 - 201.3 Ma



ID: 2767078
Holyoke Basalt

Age: Early Jurassic (174.1 - 201.3 Ma)

Stratigraphic Name: Holyoke Basalt

Description: Greenish-gray to black (weathers bright orange to brown), fine- to coarse-grained, grading from basalt near contacts to gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass.

Comments: Part of Central Lowlands; Newark Terrane - Hartford and Pomperaug Mesozoic Basins. Part of Newark Supergroup (Upper Triassic and Lower Jurassic). Part of Meriden Formation of Krynine (1950) (Lower Jurassic); CT005. 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:{basalt,gabbro}

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]

Ordovician - Neoproterozoic
443.8 - 1000 Ma



ID: 3190671
Precambrian-Phanerozoic sedimentary rocks

Age: Neoproterozoic to Ordovician (443.8 - 1000 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)
Silliman, Benjamin. (1819), New localities of agate, chalcedony, chabazite, stilbite, analcime, prehnite, etc. American Journal of Science: 1: 134-135.
Brunet, William. (1977), Mineral Collecting in Woodbury-Southbury, Connecticut. Rocks and Minerals: 52(4): 182-183.
Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407.
Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
Vajdak, Josef. (1998): New Mineral Finds in the Second Half of 1997, News from Josef Vajdak of Pequa Rare Minerals and Metals. Mineral News: 14(1): 4.
Moore, Thomas. (2007): What's New in Minerals. Mineralogical Record: 38(3): 214.

External Links

www.johnbetts-fineminerals.com/jhbnyc/mineralmuseum


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