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Cordierite locality, Union, Tolland Co., Connecticut, USAi
Regional Level Types
Cordierite locality- not defined -
Union- not defined -
Tolland Co.County
ConnecticutState
USACountry

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Key
Latitude & Longitude (WGS84):
41° 59' 30'' North , 72° 8' 0'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Holland1,464 (2017)8.3km
Wales1,767 (2017)11.4km
Southbridge19,030 (2017)12.4km
Stafford12,029 (2017)12.9km
Sturbridge2,253 (2017)13.7km


Schairer (1931) describes the cordierite as, "Small crystals and irregular grains of excellent color in road cut just west of the south end of Bigelow Pond, Union."

Elwell reported on this locality in 1940:

"About 1 1/2 miles northeast from the village of Union...there was once the attractive Bigelow Pond just north of Conn. Route 198. Just west of the south end of this pond were exposures of [Ordovician Brimfield] schists...In the road cut through these schists iolite crystals of excellent color had been found.

"T. Lipton Smith and I set out one day to find this locality. We stopped at a garage in the neighborhood to inquire directions and learned for the first time that Bigelow Pond was no more—it went out with the flood when the dam gave way [due to the Hurricane of 1938]...We found the locality without further trouble and collected garnets, iolite and moonstone. Bigelow Pond is no more—it is now a brook!"

Note: the dam for Bigelow Pond has since been rebuilt and the highway is now state Route 171.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


9 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47
Albite var: Andesine
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47
Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
Description: Small crystals and irregular grains of excellent color
Reference: Elwell, Wilbur J. (1940): Three Connecticut Localities. Rocks & Minerals, vol. 15, no. 9, p. 298.; Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47
Graphite
Formula: C
Reference: Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47
Microcline
Formula: K(AlSi3O8)
Reference: Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47
Pyrite
Formula: FeS2
Reference: Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47
Quartz
Formula: SiO2
Reference: Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47
Sillimanite
Formula: Al2(SiO4)O
Reference: Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47
Zircon
Formula: Zr(SiO4)
Reference: Barker. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. AmMin 47

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Graphite1.CB.05aC
Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
var: Andesine9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Cordierite9.CJ.10(Mg,Fe)2Al3(AlSi5O18)
Microcline9.FA.30K(AlSi3O8)
Sillimanite9.AF.05Al2(SiO4)O
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Garnet Group'-X3Z2(SiO4)3

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
Graphite1.3.6.2C
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
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
Sillimanite52.2.2a.1Al2(SiO4)O
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with Al substituted rings
Cordierite61.2.1.1(Mg,Fe)2Al3(AlSi5O18)
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)
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Albite
var: Andesine
-(Na,Ca)[Al(Si,Al)Si2O8]
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
CCarbon
C GraphiteC
OOxygen
O Cordierite(Mg,Fe)2Al3(AlSi5O18)
O Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O Garnet GroupX3Z2(SiO4)3
O MagnetiteFe2+Fe23+O4
O MicroclineK(AlSi3O8)
O QuartzSiO2
O SillimaniteAl2(SiO4)O
O ZirconZr(SiO4)
O AlbiteNa(AlSi3O8)
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
NaSodium
Na Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg Cordierite(Mg,Fe)2Al3(AlSi5O18)
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
AlAluminium
Al Cordierite(Mg,Fe)2Al3(AlSi5O18)
Al Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al MicroclineK(AlSi3O8)
Al SillimaniteAl2(SiO4)O
Al AlbiteNa(AlSi3O8)
SiSilicon
Si Cordierite(Mg,Fe)2Al3(AlSi5O18)
Si Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si Garnet GroupX3Z2(SiO4)3
Si MicroclineK(AlSi3O8)
Si QuartzSiO2
Si SillimaniteAl2(SiO4)O
Si ZirconZr(SiO4)
Si AlbiteNa(AlSi3O8)
SSulfur
S PyriteFeS2
KPotassium
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
K MicroclineK(AlSi3O8)
CaCalcium
Ca Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
FeIron
Fe Cordierite(Mg,Fe)2Al3(AlSi5O18)
Fe PyriteFeS2
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe MagnetiteFe2+Fe23+O4
ZrZirconium
Zr ZirconZr(SiO4)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Schairer, John F. (1931): The Minerals of Connecticut. Connecticut Geological and Natural History, Bulletin 51.
Elwell, Wilbur J. (1940): Three Connecticut Localities. Rocks & Minerals: 15(9): 298.
Barker, Fred. (1962): Cordierite Garnet Gneiss and Associated Microcline-Rich Pegmatite at Sturbridge, Massachusetts and Union, Connecticut. American Mineralogist: 47: 907-18.

Other Regions, Features and Areas containg this locality

North America PlateTectonic Plate

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