ALMOST THERE!. Help us with a final push needed to keep mindat.org running. Click here to help.
Catawiki are hosting a mindat.org benefit auction. All proceeds to mindat.org! BID NOW
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Becker Quarry (Becker's Quarry), West Willington, Willington, Tolland Co., Connecticut, USAi
Regional Level Types
Becker Quarry (Becker's Quarry)Quarry
West Willington- not defined -
Willington- not defined -
Tolland Co.County
ConnecticutState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
Key
Lock Map
Latitude & Longitude (WGS84): 41° 52' 19'' North , 72° 16' 24'' West
Latitude & Longitude (decimal): 41.87222,-72.27361
GeoHash:G#: drkw5qegq
Locality type:Quarry
Köppen climate type:Dfb : Warm-summer humid continental climate


Most famous for its Tessin habit and sceptered quartz crystals, plus assemblage of magnesite, almandine, pyrite, tourmaline, and free-standing kyanite crystals. As described by Ague (1995), the host rock is a granulite facies mafic gneiss (metagabbro) consisting of anorthite (An70-80), clinopyroxene, orthopyroxene and biotite with accessory quartz, and retrograde magnesio-hornblende and cummingtonite. Hydrothermal vein minerals formed in open Alpine-type fractures that cross-cut the foliation of the bedrock when it was under amphibolite facies conditions - about 15-30 km deep and 500-550 degrees C. The most common assemblage is quartz-almandine-kyanite-magnesite-biotite-albite (An20-40)-ankerite-muscovite. Less common is quartz-almandine-magnesio-hornblende-magnesite-albite (An20-40)-ankerite-biotite. Also in the veins are accessory staurolite, fluorapatite, tourmaline, zircon, ilmenite, pyrrhotite and chalcopyrite crystals (and rutile not mentioned by Ague). Calcite and pyrite formed under lower P-T conditions much later. Many minerals are coated with a dull gray-green layer of very fine-grained, retrograde sericite/chlorite/clay.

This is an operating quarry and collecting is not allowed without permission, which in recent years is rarely given.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


21 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Habit: equant microcrystals
Colour: white
Description: Formed in the vein assemblages, composition An20-40.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Almandine
Formula: Fe2+3Al2(SiO4)3
Habit: trapezohedral
Colour: red to maroon
Description: Pocket crystals with finely striated faces can reach over 7 cm. Compositionally zoned, with up to about 0.2 mole fraction grossular, 0.15 mole fraction pyrope, and 0.05 mole fraction spessartine - more toward the crystals' cores.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Habit: rhombohedral
Description: Typical small rhombs <1 cm. Uncertain in the reference if the crystals are true ankerite under the revised definition, or ferroan dolomite, or how to distinguish them from the much more common magnesite.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Anorthite
Formula: Ca(Al2Si2O8)
Habit: anhedral
Description: component of the host metagabbro, composition An70-80.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
'Biotite'
Habit: tabular
Colour: black
Description: Mostly as a component of the host metagabbro, but also as euhedral crystals in the open veins to about 1 cm.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Calcite
Formula: CaCO3
Habit: flat rhombohedra, usually in rosette aggregates
Colour: white to colorless
Description: As rosette aggregates to around 5 mm, a late-forming mineral usually found on top of the high P-T assemblage.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Chalcopyrite
Formula: CuFeS2
Description: A rarer accessory mineral in the vein assemblage.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
'Chlorite Group'
Colour: gray-green
Description: Very fine-grained alteration of primary minerals, with sericite and clays.
Reference: P Cristofono collection; Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
'Clinopyroxene Subgroup'
Habit: anhedral
Colour: black
Description: A component of the host metagabbro.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Cummingtonite
Formula: ☐{Mg2}{Mg5}(Si8O22)(OH)2
Description: Metamorphic retrograde alteration of pyroxene.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Fluorapatite
Formula: Ca5(PO4)3F
Description: An uncommon mineral in the open vein assemblage.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Ilmenite
Formula: Fe2+TiO3
Description: An accessory mineral in the open vein assemblage. As inclusions in almandine.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Kyanite
Formula: Al2(SiO4)O
Habit: elongated bladed prisms flattened parallel to (100), solitary or in feathery aggregates
Colour: colorless, gray, light to dark blue blue
Description: As free standing crystals to 5 cm in the open vein assemblage - a rarity in the state, typically with ragged edges and coated/partially altered to gray-green sericite/chlorite/clay minerals, though some are well terminated.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Magnesio-hornblende
Formula: ☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Habit: elongated prismatic
Colour: black
Description: Mostly as a metamorphic retrograde alteration of pyroxene in the host metagabbro, but also as an uncommon mineral in the open vein assemblage - a rarity in the state. Crystals to 1 cm.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Magnesite
Formula: MgCO3
Habit: rhombohedral
Colour: tan to brown
Description: Small rhombs <1 cm common, but crystals can reach several cm. Much more common than reported ankerite. Iron typically in the range of 0.05-0.30 apfu, though reportedly a few samples have outer rims grading to pure siderite.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Magnesite var: Ferroan Magnesite
Formula: (Mg,Fe)CO3
Habit: rhombohedral
Colour: tan to light brown
Description: Crystals to several cm. Much more common than reported ankerite. Iron typically in the range of 0.05-0.30 apfu, though reportedly a few samples have outer rims grading to pure siderite.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Habit: pseudo-hexagonal tabular
Colour: silvery to greenish
Description: Crystals in the open vein assemblage to about 1 cm.
Reference: P Cristofono collection, 2008; Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
'Orthopyroxene Subgroup'
Habit: anhedral
Description: A major component of the host metagabbro.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Pyrite
Formula: FeS2
Habit: cubic
Colour: pale brassy
Description: A low-temp mineral of the open vein assemblages, typically as druses coating the earlier high P-T assemblage. Rarely as cubes typically about 1 cm, can form complex rosette aggregates to over 5 cm across and 3.5 cm thick.
Reference: P Cristofono collection, 2008; Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Pyrrhotite
Formula: Fe7S8
Habit: tabular pseudohexagonal
Colour: bronzy
Description: A rare accessory mineral of the open vein assemblage. Euhedral crystals to 1.5 cm very rare in Connecticut - this may be the only such locality.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Quartz
Formula: SiO2
Habit: Tessin habit, scepters, reverse scepters
Colour: colorless to white, smoky
Description: A very common mineral in the open vein assemblage (and an accessory in the host metagabbro). Mostly small <1-1.5 cm crystals with wide variety of complex forms, Tessin and scepters, reverse scepters and combinations. Many are doubly-terminated. Larger crystals can reach up to 7 cm and are typically Tessin habit showing the various steep positive rhombohedra, such as {20bar21}, {30bar31} and {50bar53} and their negative equivalents {03bar32}, {02bar21}, {03bar31} and {05bar53}.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.; Horowitz, Irving L. (2003): The Remarkable Quartz Crystals of West Willington, Tolland County, Connecticut. Rocks & Minerals: 78(4): 257-261.
Quartz var: Smoky Quartz
Formula: SiO2
Habit: scepters, reverse scepters, Tessin habit
Colour: smoky
Description: A common mineral in the open vein assemblage. Mostly small <1-1.5 cm crystals with wide variety of complex forms, Tessin and scepters, reverse scepters and combinations. Many are doubly-terminated. Larger crystals can reach up to 7 cm and are typically Tessin habit showing the various steep positive rhombohedra, such as {20bar21}, {30bar31} and {50bar53} and their negative equivalents {03bar32}, {02bar21}, {03bar31} and {05bar53}.
Reference: A very common mineral in the open vein assemblage (and an accessory in the host metagabbro). Mostly small <1-1.5 cm crystals with wide variety of complex forms, Tessin and scepters, reverse scepters and combinations. Many are doubly-terminated. Larger crystals can reach up to 7 cm and are typically Tessin habit showing the various steep positive rhombohedra, such as {20bar21}, {30bar31} and {50bar53} and their negative equivalents {03bar32}, {02bar21}, {03bar31} and {05bar53}.
Rutile
Formula: TiO2
Habit: elongated, striated prisms.
Colour: red
Description: An accessory mineral in the open vein assemblage, as microcrystals.
Reference: P Cristofono collection, 2008
Siderite
Formula: FeCO3
Habit: rhombohedral
Description: As outer rims of a few analyzed magnesite crystals.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Staurolite
Formula: Fe2+2Al9Si4O23(OH)
Description: A rare accessory in the open vein assemblage.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Titanite
Formula: CaTi(SiO4)O
Colour: light brown
Description: A rare accessory mineral in the open vein assemblage.
Reference: P Cristofono collection
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Habit: trigonal elongated, striated prisms with rhombhedral terminations
Colour: black
Description: very sharp, lustrous pocket crystals to several cms. Species likely schorl or perhaps dravite.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Zircon
Formula: Zr(SiO4)
Description: A rare accessory mineral in the open vein assemblage.
Reference: Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Chalcopyrite'2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
Ilmenite4.CB.05Fe2+TiO3
Quartz4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
'Ankerite'5.AB.10Ca(Fe2+,Mg)(CO3)2
'Calcite'5.AB.05CaCO3
Magnesite5.AB.05MgCO3
var: Ferroan Magnesite5.AB.05(Mg,Fe)CO3
Siderite5.AB.05FeCO3
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
'Albite'9.FA.35Na(AlSi3O8)
'Almandine'9.AD.25Fe2+3Al2(SiO4)3
'Anorthite'9.FA.35Ca(Al2Si2O8)
'Cummingtonite'9.DE.05☐{Mg2}{Mg5}(Si8O22)(OH)2
Kyanite9.AF.15Al2(SiO4)O
Magnesio-hornblende9.DE.10☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Staurolite9.AF.30Fe2+2Al9Si4O23(OH)
Titanite9.AG.15CaTi(SiO4)O
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Biotite'-
'Chlorite Group'-
'Clinopyroxene Subgroup'-
Orthopyroxene Subgroup-
Tourmaline-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Rutile4.4.1.1TiO2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Magnesite14.1.1.2MgCO3
Siderite14.1.1.3FeCO3
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)2
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Kyanite52.2.2c.1Al2(SiO4)O
Staurolite52.2.3.1Fe2+2Al9Si4O23(OH)
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Cummingtonite66.1.1.1☐{Mg2}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
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.
Anorthite-Ca(Al2Si2O8)
'Biotite'-
'Chlorite Group'-
'Clinopyroxene Subgroup'-
Magnesio-hornblende-☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Magnesite
var: Ferroan Magnesite
-(Mg,Fe)CO3
'Orthopyroxene Subgroup'-
Quartz
var: Smoky Quartz
-SiO2
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
H Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H StauroliteFe22+Al9Si4O23(OH)
BBoron
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
CCarbon
C AnkeriteCa(Fe2+,Mg)(CO3)2
C CalciteCaCO3
C Magnesite (var: Ferroan Magnesite)(Mg,Fe)CO3
C MagnesiteMgCO3
C SideriteFeCO3
OOxygen
O AlbiteNa(AlSi3O8)
O AlmandineFe32+Al2(SiO4)3
O AnkeriteCa(Fe2+,Mg)(CO3)2
O AnorthiteCa(Al2Si2O8)
O CalciteCaCO3
O Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
O Magnesite (var: Ferroan Magnesite)(Mg,Fe)CO3
O FluorapatiteCa5(PO4)3F
O IlmeniteFe2+TiO3
O KyaniteAl2(SiO4)O
O Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
O MagnesiteMgCO3
O MuscoviteKAl2(AlSi3O10)(OH)2
O QuartzSiO2
O RutileTiO2
O SideriteFeCO3
O Quartz (var: Smoky Quartz)SiO2
O StauroliteFe22+Al9Si4O23(OH)
O TitaniteCaTi(SiO4)O
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O ZirconZr(SiO4)
FFluorine
F FluorapatiteCa5(PO4)3F
NaSodium
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
Mg Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
Mg Magnesite (var: Ferroan Magnesite)(Mg,Fe)CO3
Mg Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Mg MagnesiteMgCO3
AlAluminium
Al AlbiteNa(AlSi3O8)
Al AlmandineFe32+Al2(SiO4)3
Al AnorthiteCa(Al2Si2O8)
Al KyaniteAl2(SiO4)O
Al Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al StauroliteFe22+Al9Si4O23(OH)
SiSilicon
Si AlbiteNa(AlSi3O8)
Si AlmandineFe32+Al2(SiO4)3
Si AnorthiteCa(Al2Si2O8)
Si Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
Si KyaniteAl2(SiO4)O
Si Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si Quartz (var: Smoky Quartz)SiO2
Si StauroliteFe22+Al9Si4O23(OH)
Si TitaniteCaTi(SiO4)O
Si ZirconZr(SiO4)
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S ChalcopyriteCuFeS2
S PyriteFeS2
S PyrrhotiteFe7S8
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
Ca AnorthiteCa(Al2Si2O8)
Ca CalciteCaCO3
Ca FluorapatiteCa5(PO4)3F
Ca Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Ca TitaniteCaTi(SiO4)O
TiTitanium
Ti IlmeniteFe2+TiO3
Ti RutileTiO2
Ti TitaniteCaTi(SiO4)O
FeIron
Fe AlmandineFe32+Al2(SiO4)3
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe ChalcopyriteCuFeS2
Fe Magnesite (var: Ferroan Magnesite)(Mg,Fe)CO3
Fe IlmeniteFe2+TiO3
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe SideriteFeCO3
Fe StauroliteFe22+Al9Si4O23(OH)
CuCopper
Cu ChalcopyriteCuFeS2
ZrZirconium
Zr ZirconZr(SiO4)

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

Devonian - Silurian
358.9 - 443.8 Ma



ID: 3186140
Paleozoic sedimentary and volcanic rocks

Age: Paleozoic (358.9 - 443.8 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]

Ordovician - Cambrian
443.8 - 541 Ma



ID: 2820363
Gneiss (metavolcanic) member [of Brimfield Schist]

Age: Paleozoic (443.8 - 541 Ma)

Stratigraphic Name: Brimfield Schist

Description: Medium-gray, medium-grained, layered gneiss and schist, composed of oligoclase, quartz, and biotite; some gneiss and most schist layers contain garnet and sillimanite; some gneiss layers contain garnet, hornblende or pyroxene or grade into amphibolite or calc-silicate rock. Probably includes metavolcanic rocks.

Comments: Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Merrimack Synclinorium; Brimfield Schist and equivalent formations (includes Tatnic Hill Formation) (Upper? and Middle Ordovician). The age of the Brimfield Group in this area is Cambrian(?) based on the intrusion of 440 my Hedgehog Hill gneiss in the top of the Hamilton Reservoir Formation in the upper part of the Brimfield, although the top of the Brimfield may be Ordovician or older Paleozoic (Pease, 1989) per CT013. 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,schist}, Incidental:{amphibolite, calc silicate rock, metavolcanic}

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)
Scovil, J. (1994), What's New in Minerals. Mineralogical Record: 25: 377.
Zagielski, M., and J. Fast. (1994), A new occurrence of almandine, kyanite, and quartz in open veins in Willington, Connecticut (abstract). Rocks & Minerals 69: 136.
Ague, J. J. (1995), Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.
Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407.
Horowitz, Irving L. (2003), The Remarkable Quartz Crystals of West Willington, Tolland County, Connecticut. Rocks & Minerals: 78(4): 257-261.


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.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: December 13, 2018 07:15:15 Page generated: December 10, 2018 09:08:04
Go to top of page