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Milford, New Haven County, Connecticut, USAi
Regional Level Types
MilfordCity
New Haven CountyCounty
ConnecticutState
USACountry

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PhotosMapsSearch
01240090017272304968309.jpg
Signal Rock in 1984

Milford, New Haven County, Connecticut, USA
08413600017493360093553.jpg
Signal Rock (1906 or earlier)

Milford, New Haven County, Connecticut, USA
09702880017272041105083.jpg
Chlorite Group, etc.

Quarry Road, Milford, New Haven County, Connecticut, USA
01240090017272304968309.jpg
Signal Rock in 1984

Milford, New Haven County, Connecticut, USA
06298880017426983295626.jpg
Signal Rock (1906 or earlier)

Milford, New Haven County, Connecticut, USA
09702880017272041105083.jpg
Chlorite Group, etc.

Quarry Road, Milford, New Haven County, Connecticut, USA
01240090017272304968309.jpg
Signal Rock in 1984

Milford, New Haven County, Connecticut, USA
08413600017493360093553.jpg
Signal Rock (1906 or earlier)

Milford, New Haven County, Connecticut, USA
Neighbouring regions:
Stratford, Fairfield County, Connecticut, USA
Orange, New Haven County, Connecticut, USA
West Haven, New Haven County, Connecticut, USA
Shelton, Fairfield County, Connecticut, USA
Type:
City
Largest Settlements:
PlacePopulation
Milford52,759 (2017)
City of Milford (balance)51,271 (2017)
Woodmont1,505 (2017)
Mindat Locality ID:
220565
Long-form identifier:
mindat:1:2:220565:9
GUID (UUID V4):
0


The town of Milford was settled by Europeans in 1639, in the area known as Wepawaug to the indigenous Paugussets. It originally included what is now the town of Woodbridge until 1784 (Bethany split from that town in 1822) and town of Orange (North Milford) until 1832 (West Haven split from that town in 1921). It was incorporated as a city in 1959.

The bedrock geology is metamorphic, comprising the southern part of the Milford-Orange Belt of tectonized oceanic crust (including sheered Maltby Lakes gabbro and Allingtown basalt porphyry sheeted dikes) and Oronoque or Savin pelagic sediments. These Ordovician units have been metamorphosed to a relatively low (for the state in general) biotite/garnet grade metagabbro, amphibolite, schist and small serpentinite bodies. Epidote, clinozoisite and chlorite are abundant in these formations. The Silurian-Devonian Wepawaug Group phyllite overlies these units via a thrust fault and increases westward in metamorphic grade to kyanite. The best summary of the most recent mapping can be found in Deasy et al, 2015.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

19 valid minerals.

Rock Types Recorded


Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Albite
Formula: Na(AlSi3O8)
Habit: tabular
Colour: white
Description: Mostly a rock-forming mineral, but a few small crystals occur in cavities.
ⓘ 'Amphibole Supergroup' ?
Formula: AB2C5(T8O22)W2
Colour: whitish green
Description: "Amianthus is sometimes nearly as fine as that of Corsica." (Robinson 1825). Uncertain if he was referring to brucite or byssolite.
ⓘ 'Amphibole Supergroup var. Byssolite' ?
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Colour: whitish green
Description: "Amianthus is sometimes nearly as fine as that of Corsica." (Robinson 1825). Uncertain if he was referring to brucite or byssolite.
ⓘ Babingtonite
Formula: Ca2Fe2+Fe3+Si5O14(OH)
ⓘ Brucite ?
Formula: Mg(OH)2
Colour: whitish green
Description: "Amianthus is sometimes nearly as fine as that of Corsica." (Robinson 1825). Uncertain if he was referring to brucite or byssolite.
ⓘ Calcite
Formula: CaCO3
Habit: cleavable masses
Colour: white
Description: Minor massive material in veins associated with clinozoisite, quartz, clinochlore.
ⓘ Chalcopyrite
Formula: CuFeS2
Habit: massive
Colour: brassy
Description: Minor massive material in veins associated with clinozoisite, quartz, clinochlore.
ⓘ 'Chlorite Group'
Habit: micaceous
Colour: dark green
Description: In veins associated with clinozoisite, quartz.
ⓘ Chromite
Formula: Fe2+Cr3+2O4
Habit: granular
Colour: black
Description: fine-grained and similar to magnetite, but not as magnetic, disseminated in the calcite and lizardite.
ⓘ Chrysotile
Formula: Mg3(Si2O5)(OH)4
Habit: fibrous
Colour: pale green
Description: in veins cross-cutting lizardite
ⓘ Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
ⓘ Clinozoisite
Formula: (CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Habit: elongated prisms, acicular
Colour: brown
Description: In veins as parallel or radiating acicular, unterminated crystals associated with quartz, clinochlore, sulfides.
ⓘ Dolomite
Formula: CaMg(CO3)2
Description: "mixed with quartz and tremolite" (Robinson 1825)
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Habit: radiating crystals
Colour: olive green
Description: "in veins or amorphous masses, sometimes in radiated crystals " (Robonson 1825)
ⓘ Goethite
Formula: Fe3+O(OH)
Habit: massive
Colour: dark brown
Description: One specimen in particular appears to have replaced calcite.
ⓘ Grossular
Formula: Ca3Al2(SiO4)3
References:
Fred Schuster
✪ Lizardite
Formula: Mg3(Si2O5)(OH)4
Habit: massive
Colour: yellow to dark green
Description: nodules or irregular masses, massive to variegated and mixed with calcite
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
Habit: granular
Colour: black
Description: fine-grained and disseminated in the calcite and lizardite
ⓘ Pyrite
Formula: FeS2
Habit: massive
Description: Minor massive material in veins associated with clinozoisite, quartz, clinochlore.
ⓘ Quartz
Formula: SiO2
Description: with tremolite and dolomite
ⓘ Talc
Formula: Mg3Si4O10(OH)2
Habit: foliated
Description: "Slaty Chlorite, in layers about 1/5 of an inch thick, between primitive marble and primitive greenstone; soft, unctuous, and frequently stained red." (Robinson 1825). Although not specifically called talc by Robinson, talc was observed in this contact relationship at another nearby serpentinite in the 1980s.
ⓘ Tremolite
Formula: ◻Ca2Mg5(Si8O22)(OH)2
Description: "with dolomite and quartz" (Robinson 1825)

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘGoethite4.00.Fe3+O(OH)
ⓘChromite4.BB.05Fe2+Cr3+2O4
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘQuartz4.DA.05SiO2
ⓘBrucite ?4.FE.05Mg(OH)2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘDolomite5.AB.10CaMg(CO3)2
Group 9 - Silicates
ⓘChrysotile9.00.Mg3(Si2O5)(OH)4
ⓘGrossular9.AD.25Ca3Al2(SiO4)3
ⓘClinozoisite9.BG.05a(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘTremolite9.DE.10◻Ca2Mg5(Si8O22)(OH)2
ⓘBabingtonite9.DK.05Ca2Fe2+Fe3+Si5O14(OH)
ⓘTalc9.EC.05Mg3Si4O10(OH)2
ⓘClinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
ⓘLizardite9.ED.15Mg3(Si2O5)(OH)4
ⓘAlbite9.FA.35Na(AlSi3O8)
Unclassified
ⓘ'Amphibole Supergroup' ?-AB2C5(T8O22)W2
ⓘ'Chlorite Group'-
ⓘ'Amphibole Supergroup
var. Byssolite' ?		-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2

List of minerals for each chemical element

HHydrogen
Hⓘ BabingtoniteCa2Fe2+Fe3+Si5O14(OH)
Hⓘ BruciteMg(OH)2
Hⓘ ChrysotileMg3(Si2O5)(OH)4
Hⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Hⓘ Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ GoethiteFe3+O(OH)
Hⓘ LizarditeMg3(Si2O5)(OH)4
Hⓘ TalcMg3Si4O10(OH)2
Hⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Hⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
CCarbon
Cⓘ CalciteCaCO3
Cⓘ DolomiteCaMg(CO3)2
OOxygen
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ Amphibole SupergroupAB2C5(T8O22)W2
Oⓘ BabingtoniteCa2Fe2+Fe3+Si5O14(OH)
Oⓘ BruciteMg(OH)2
Oⓘ CalciteCaCO3
Oⓘ ChrysotileMg3(Si2O5)(OH)4
Oⓘ ChromiteFe2+Cr23+O4
Oⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Oⓘ Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Oⓘ DolomiteCaMg(CO3)2
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ GoethiteFe3+O(OH)
Oⓘ GrossularCa3Al2(SiO4)3
Oⓘ LizarditeMg3(Si2O5)(OH)4
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ QuartzSiO2
Oⓘ TalcMg3Si4O10(OH)2
Oⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Oⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
FFluorine
Fⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
NaSodium
Naⓘ AlbiteNa(AlSi3O8)
MgMagnesium
Mgⓘ BruciteMg(OH)2
Mgⓘ ChrysotileMg3(Si2O5)(OH)4
Mgⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Mgⓘ DolomiteCaMg(CO3)2
Mgⓘ LizarditeMg3(Si2O5)(OH)4
Mgⓘ TalcMg3Si4O10(OH)2
Mgⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
AlAluminium
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Alⓘ Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ GrossularCa3Al2(SiO4)3
Alⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SiSilicon
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ BabingtoniteCa2Fe2+Fe3+Si5O14(OH)
Siⓘ ChrysotileMg3(Si2O5)(OH)4
Siⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Siⓘ Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ GrossularCa3Al2(SiO4)3
Siⓘ LizarditeMg3(Si2O5)(OH)4
Siⓘ QuartzSiO2
Siⓘ TalcMg3Si4O10(OH)2
Siⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Siⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SSulfur
Sⓘ ChalcopyriteCuFeS2
Sⓘ PyriteFeS2
ClChlorine
Clⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
CaCalcium
Caⓘ BabingtoniteCa2Fe2+Fe3+Si5O14(OH)
Caⓘ CalciteCaCO3
Caⓘ Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
Caⓘ DolomiteCaMg(CO3)2
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ GrossularCa3Al2(SiO4)3
Caⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
TiTitanium
Tiⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
CrChromium
Crⓘ ChromiteFe2+Cr23+O4
FeIron
Feⓘ BabingtoniteCa2Fe2+Fe3+Si5O14(OH)
Feⓘ ChalcopyriteCuFeS2
Feⓘ ChromiteFe2+Cr23+O4
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ GoethiteFe3+O(OH)
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ PyriteFeS2
CuCopper
Cuⓘ ChalcopyriteCuFeS2

Fossils

This region is too big or complex to display the fossil list, try looking at smaller subregions.

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/Milford,_Connecticut
Wikidata ID:Q755798
GeoNames ID:4838671

Localities in this Region

USA

Other Regions, Features and Areas that Intersect

North AmericaContinent
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

Deasy, Ryan, Robert P. Wintsch, Bryan Wathen, Ryan McAlteer, David Bish and Romain Meyer. (2015), Tectonic Slivers of Oceanic Terrane(s)?: Sheeted Dikes and Sheared Gabbros in south-central Connecticut: Field Trip A1 in Guidebook for Field Trips in Connecticut and Massachusetts, 107th Meeting of the New England Intercollegiate Geological Conference, Wesleyan University, Middletown, Connecticut, Martha S. Gilmore and Phillip G. Resor editors.
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