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Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USAi
Regional Level Types
Agstone Company Limestone QuarryQuarry
DanburyMunicipality
Fairfield CountyCounty
ConnecticutState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
41° 25' 40'' North , 73° 24' 44'' West
Latitude & Longitude (decimal):
41.42778,-73.41222
GeoHash:
G#: dr7g9mwy7
GRN:
N28W40
Type:
Quarry
Köppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Danbury84,657 (2017)5.1km
Bethel9,549 (2017)6.3km
New Fairfield14,126 (2017)7.5km
Newtown1,967 (2017)9.2km
Putnam Lake3,844 (2017)11.8km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Danbury Mineralogical SocietyDanbury, Connecticut5km
New Haven Mineral ClubNew Haven, Connecticut43km
Stamford Mineralogical SocietyStamford, Connecticut43km
Bristol Gem & Mineral ClubBristol, Connecticut47km
Mindat Locality ID:
23320
Long-form identifier:
mindat:1:2:23320:3
GUID (UUID V4):
294ad72e-a8a5-4f23-9723-9169878ea1b7


The quarry, in the Cambrian Stockbridge marble and long inactive, is located between U. S. Route 7 expressway and the New York, New Haven and Hartford Railroad tracks. It can be easily accessed from White Turkey Road extension near exit 11 from U. S. Route 7 and is immediately south of a commuter parking lot. A new rock cut along White Turkey Road extension was made just east of the quarry.

Januzzi (1959) states: "Collecting is not allowed but collection of minerals from this locality, including many fine calcite crystals may be seen at the office."

Januzzi (1994) mistakenly lists this locality in Brookfield.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


21 valid minerals. 1 erroneous literature entry.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Almandine ?
Formula: Fe2+3Al2(SiO4)3
Description: Included in a list of minerals with no details.
ⓘ Aragonite
Formula: CaCO3
Description: "commonly reported" Ryerson (1972).
ⓘ Baryte
Formula: BaSO4
Description: Included in lists of minerals found, but with no details.
ⓘ 'Biotite' ?
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Description: Included in lists of minerals with no details.
✪ Calcite
Formula: CaCO3
Habit: scalenohedral
Colour: white to pale yellow
Description: "The most well-known locality for large, well-formed calcite crystals occurs in the Beaverbrook District of Danbury, Connecticut." Januzzi (1959). Based on more specific references to other minerals, this statement refers to the Agstone Co. Quarry near the border with Brookfield. He also reports in 1959: "Collecting is not allowed but collection of minerals from this locality, including many fine calcite crystals may be seen at the office." Januzzi (1994) includes a photo of a a doubly-terminated, scalenohedral crystal dusted with tiny pyrites.
ⓘ Celestine
Formula: SrSO4
Colour: pale blue
Description: Included in lists of minerals without details, but Januzzi (1994) includes a photograph.
ⓘ Chalcopyrite
Formula: CuFeS2
Description: "Chalcopyrite has also been found at the limestone quarry in the Beaverbrook District." Januzzi (1959).
ⓘ Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Description: Included in a lists of minerals without details, but plausible for the formation.
ⓘ 'Columbite-(Fe)-Columbite-(Mn) Series'
Habit: blocky, subhedral
Colour: black
Description: Januzzi (1994) includes a photo of small crystals in massive quartz, apparently from one of the small cross-cutting pegmatites.
ⓘ Diopside
Formula: CaMgSi2O6
Description: Included in a lists of minerals without details, but plausible for the formation.
ⓘ Graphite
Formula: C
Description: Included in a lists of minerals without details, but plausible for the formation.
ⓘ Gypsum
Formula: CaSO4 · 2H2O
Habit: micro plumose aggregates
Colour: colorless but typically stained yellow
Description: Micro secondary crystals from the reaction of pyrite, calcite and water and "found as seams in limestone associated with calcite at the limestone quarry, Beaver Brook District, Danbury" Januzzi (1959). Schooner (1961) reports seeing a good example.
ⓘ Gypsum var. Selenite
Formula: CaSO4 · 2H2O
Habit: micro plumose aggregates
Colour: colorless but typically stained yellow
Description: Micro secondary crystals from the reaction of pyrite, calcite and water and "found as seams in limestone associated with calcite at the limestone quarry, Beaver Brook District, Danbury" Januzzi (1959). Schooner (1961) reports seeing a good example.
ⓘ 'Hornblende Root Name Group'
Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
Description: Included in a lists of minerals without details, but plausible for the formation.
ⓘ 'Limonite'
Description: Ubiquitous in Connecticut.
ⓘ Microcline
Formula: K(AlSi3O8)
Description: Included in lists of minerals without details, but plausible in small pegmatites.
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Palygorskite
Formula: ◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O
Description: TEM-EDS analysis showed a sample to be sepiolite.
ⓘ Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Description: Included in lists of minerals without details, but plausible for the formation - a common accessory in marble.
ⓘ Pyrite
Formula: FeS2
Habit: small crystals on calcite
Description: Included in a list of minerals with no details, but plausible for the formation - a common accessory in marble. Januzzi (1994) shows a photo of small crystals on a calcite crystal.
ⓘ Pyrrhotite
Formula: Fe1-xS
Description: Included in a list of minerals without details, but plausible for the formation.
ⓘ Quartz
Formula: SiO2
Habit: fibrous, or as quartzoids
Colour: smoky
Description: Included in a list of minerals without details, but plausible for the formation.
ⓘ 'Scapolite'
Habit: massive to prismatic
Colour: white to pale yellow-green
Fluorescence: peach (SW), yellow (MW), pink (LW)
Description: Mostly massive material, easy to miss but notable by its semi-fibrous texture on broken surface. Prismatic crystals rare.
ⓘ Scheelite
Formula: Ca(WO4)
Description: "commonly reported" Ryerson (1972).
✪ Sepiolite
Formula: Mg4(Si6O15)(OH)2 · 6H2O
Habit: fibrous mats
Colour: white to pale gray-brown
Description: Found as a thin layer sandwiched between opposing calcite crystals. Analyzed in 2017 via TEM-EDS. Januzzi (1994) incorrectly called it palygorskite and includes a photo.
ⓘ Talc
Formula: Mg3Si4O10(OH)2
Description: Included in lists of minerals without details, but plausible for the formation.
ⓘ Titanite
Formula: CaTi(SiO4)O
Habit: tabular
Colour: brown
ⓘ Tremolite
Formula: ◻Ca2Mg5(Si8O22)(OH)2
Description: A common accessory in marble.

Gallery:

CaCO3ⓘ Calcite

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘGraphite1.CB.05aC
Group 2 - Sulphides and Sulfosalts
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘAragonite5.AB.15CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4
ⓘCelestine7.AD.35SrSO4
ⓘGypsum7.CD.40CaSO4 · 2H2O
ⓘvar. Selenite7.CD.40CaSO4 · 2H2O
ⓘScheelite7.GA.05Ca(WO4)
Group 9 - Silicates
ⓘAlmandine ?9.AD.25Fe2+3Al2(SiO4)3
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘDiopside9.DA.15CaMgSi2O6
ⓘTremolite9.DE.10◻Ca2Mg5(Si8O22)(OH)2
ⓘTalc9.EC.05Mg3Si4O10(OH)2
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘPhlogopite9.EC.20KMg3(AlSi3O10)(OH)2
ⓘClinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
ⓘPalygorskite ?9.EE.20◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O
ⓘSepiolite9.EE.25Mg4(Si6O15)(OH)2 · 6H2O
ⓘMicrocline9.FA.30K(AlSi3O8)
Unclassified
ⓘ'Limonite'-
ⓘ'Biotite' ?-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Columbite-(Fe)-Columbite-(Mn) Series'-
ⓘ'Scapolite'-
ⓘ'Hornblende Root Name Group'-◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2

List of minerals for each chemical element

HHydrogen
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Hⓘ GypsumCaSO4 · 2H2O
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ Palygorskite◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O
Hⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Hⓘ SepioliteMg4(Si6O15)(OH)2 · 6H2O
Hⓘ TalcMg3Si4O10(OH)2
Hⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Hⓘ Gypsum var. SeleniteCaSO4 · 2H2O
Hⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
CCarbon
Cⓘ AragoniteCaCO3
Cⓘ CalciteCaCO3
Cⓘ GraphiteC
OOxygen
Oⓘ AragoniteCaCO3
Oⓘ AlmandineFe32+Al2(SiO4)3
Oⓘ BaryteBaSO4
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ CalciteCaCO3
Oⓘ CelestineSrSO4
Oⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Oⓘ DiopsideCaMgSi2O6
Oⓘ GypsumCaSO4 · 2H2O
Oⓘ MicroclineK(AlSi3O8)
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ Palygorskite◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O
Oⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Oⓘ QuartzSiO2
Oⓘ ScheeliteCa(WO4)
Oⓘ SepioliteMg4(Si6O15)(OH)2 · 6H2O
Oⓘ TalcMg3Si4O10(OH)2
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Oⓘ Gypsum var. SeleniteCaSO4 · 2H2O
Oⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Mgⓘ DiopsideCaMgSi2O6
Mgⓘ Palygorskite◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O
Mgⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Mgⓘ SepioliteMg4(Si6O15)(OH)2 · 6H2O
Mgⓘ TalcMg3Si4O10(OH)2
Mgⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
AlAluminium
Alⓘ AlmandineFe32+Al2(SiO4)3
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Alⓘ MicroclineK(AlSi3O8)
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ Palygorskite◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O
Alⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Alⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
SiSilicon
Siⓘ AlmandineFe32+Al2(SiO4)3
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Siⓘ DiopsideCaMgSi2O6
Siⓘ MicroclineK(AlSi3O8)
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ Palygorskite◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O
Siⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Siⓘ QuartzSiO2
Siⓘ SepioliteMg4(Si6O15)(OH)2 · 6H2O
Siⓘ TalcMg3Si4O10(OH)2
Siⓘ TitaniteCaTi(SiO4)O
Siⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Siⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
SSulfur
Sⓘ BaryteBaSO4
Sⓘ CelestineSrSO4
Sⓘ ChalcopyriteCuFeS2
Sⓘ GypsumCaSO4 · 2H2O
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
Sⓘ Gypsum var. SeleniteCaSO4 · 2H2O
ClChlorine
Clⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ MicroclineK(AlSi3O8)
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Kⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Caⓘ AragoniteCaCO3
Caⓘ CalciteCaCO3
Caⓘ DiopsideCaMgSi2O6
Caⓘ GypsumCaSO4 · 2H2O
Caⓘ ScheeliteCa(WO4)
Caⓘ TitaniteCaTi(SiO4)O
Caⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Caⓘ Gypsum var. SeleniteCaSO4 · 2H2O
Caⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Tiⓘ TitaniteCaTi(SiO4)O
FeIron
Feⓘ AlmandineFe32+Al2(SiO4)3
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ ChalcopyriteCuFeS2
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
CuCopper
Cuⓘ ChalcopyriteCuFeS2
SrStrontium
Srⓘ CelestineSrSO4
BaBarium
Baⓘ BaryteBaSO4
WTungsten
Wⓘ ScheeliteCa(WO4)

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.

References

Schairer, John F. (1931): Minerals of Connecticut. State Geological and Natural History Survey of Connecticut Bulletin 51.
Januzzi, Ronald (1959) The Minerals of Western Connecticut and Southeastern New York State.. The Mineralogical Press, Danbury, Connecticut.
Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Ryerson, Kathleen H. (1972): Rock Hound's Guide to Connecticut. Pequot Press.
Januzzi, Ron E., Seaman, David M. (1976) Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut, USA.
Januzzi, Ronald. E. (1994) Mineral Data Book - Western Connecticut and Environs. Mineralogical Press, Danbury, Connecticut, USA.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 396.
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