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Willimantic, Windham, Windham County, Connecticut, USAi
Regional Level Types
WillimanticCity
WindhamTown
Windham CountyCounty
ConnecticutState
USACountry

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Latitude & Longitude (WGS84):
41° 42' 47'' North , 72° 13' 4'' West
Latitude & Longitude (decimal):
41.71313,-72.21789
GeoHash:
G#: drktk9ss9
GRN:
N28W40
Type:
City
KΓΆppen climate type:
Dfb : Warm-summer humid continental climate
Mindat Locality ID:
56463
Long-form identifier:
mindat:1:2:56463:5
GUID (UUID V4):
973a7bd9-64c0-4188-a340-1171dd3c155e


Willimantic is a city with an incorporated boundary completely within the town of Windham's boundary.

Specimens of coarse-grained, brown, prismatic sillimanite in granular quartz are noted from somewhere in Willimantic - no reference or collection seems to have recorded the specific location. Other similar specimens are found at the type locality in Chester, Conn. and at the Falls of the Yantic in Norwich, Conn. Both of these localities are hosted by the Tatnic Hill Formation, which crops out around, but not within Willimantic.

The U. S. Route 6 Willimantic Bypass highway is not in Willimantic, but passes mostly through Coventry, where most of the rock cuts (in the Tatnic Hill Formation) are located, and within the town of Windham. Specimens from the bypass should be posted on this mindat page:
http://www.mindat.org/loc-212277.html

The sillimanite specimens apparently predate the Route 6 construction.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

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

10 valid minerals.

Rock Types Recorded

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

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

β“˜ Albite
Formula: Na(AlSi3O8)
β“˜ Beryl
Formula: Be3Al2(Si6O18)
β“˜ Bismutite
Formula: (BiO)2CO3
β“˜ Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
β“˜ 'Garnet Group'
Formula: X3Z2(SiO4)3
β“˜ Magnetite
Formula: Fe2+Fe3+2O4
Habit: massive
Colour: black
Description: Massive material in granular quartz with coarse-grained, clove-brown sillimanite crystals from an unspecified location.
β“˜ Microcline
Formula: K(AlSi3O8)
β“˜ Prehnite
Formula: Ca2Al2Si3O10(OH)2
β“˜ Quartz
Formula: SiO2
β“˜ Quartz var. Smoky Quartz
Formula: SiO2
Description: Described as occurring in "fine crystals". Perhaps it is the source of this unattributed specimen: http://www.mindat.org/photo-472700.html
βœͺ 'Scapolite'
Habit: elongated prismatic with square cross-section
Colour: white
Fluorescence: pink under SW, white under MW and LW UV
Description: Bar-shaped crystals to about 3 cm in quartz. From an unrecorded locality, formerly in the John Legro collection from the 1920s.
βœͺ Sillimanite
Formula: Al2(SiO4)O
Habit: elongated prisms
Colour: clove brown
Description: Vitreous, translucent, somewhat chatoyant, clove brown crystals to 4 cm in granular quartz with magnetite are from an unspecified location.
β“˜ Topaz
Formula: Al2(SiO4)(F,OH)2
Habit: elongated prismatic
Colour: colorless
Description: Partial, at least 3 cm prismatic crystal in pegmatitic albite/quartz matrix in the Yale Peabody Museum collection MIN.044604. https://collections.peabody.yale.edu/search/Record/YPM-MIN-044604

Gallery:

Al2(SiO4)Oβ“˜ Sillimanite

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
β“˜Quartz4.DA.05SiO2
β“˜var. Smoky Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
β“˜Bismutite5.BE.25(BiO)2CO3
Group 9 - Silicates
β“˜Sillimanite9.AF.05Al2(SiO4)O
β“˜Topaz9.AF.35Al2(SiO4)(F,OH)2
β“˜Beryl9.CJ.05Be3Al2(Si6O18)
β“˜Prehnite9.DP.20Ca2Al2Si3O10(OH)2
β“˜Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
β“˜Microcline9.FA.30K(AlSi3O8)
β“˜Albite9.FA.35Na(AlSi3O8)
Unclassified
β“˜'Scapolite'-
β“˜'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
Hβ“˜ ClinochloreMg5Al(AlSi3O10)(OH)8
Hβ“˜ PrehniteCa2Al2Si3O10(OH)2
Hβ“˜ TopazAl2(SiO4)(F,OH)2
BeBeryllium
Beβ“˜ BerylBe3Al2(Si6O18)
CCarbon
Cβ“˜ Bismutite(BiO)2CO3
OOxygen
Oβ“˜ AlbiteNa(AlSi3O8)
Oβ“˜ Bismutite(BiO)2CO3
Oβ“˜ BerylBe3Al2(Si6O18)
Oβ“˜ ClinochloreMg5Al(AlSi3O10)(OH)8
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ PrehniteCa2Al2Si3O10(OH)2
Oβ“˜ QuartzSiO2
Oβ“˜ SillimaniteAl2(SiO4)O
Oβ“˜ Quartz var. Smoky QuartzSiO2
Oβ“˜ TopazAl2(SiO4)(F,OH)2
Oβ“˜ Garnet GroupX3Z2(SiO4)3
FFluorine
Fβ“˜ TopazAl2(SiO4)(F,OH)2
NaSodium
Naβ“˜ AlbiteNa(AlSi3O8)
MgMagnesium
Mgβ“˜ ClinochloreMg5Al(AlSi3O10)(OH)8
AlAluminium
Alβ“˜ AlbiteNa(AlSi3O8)
Alβ“˜ BerylBe3Al2(Si6O18)
Alβ“˜ ClinochloreMg5Al(AlSi3O10)(OH)8
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ PrehniteCa2Al2Si3O10(OH)2
Alβ“˜ SillimaniteAl2(SiO4)O
Alβ“˜ TopazAl2(SiO4)(F,OH)2
SiSilicon
Siβ“˜ AlbiteNa(AlSi3O8)
Siβ“˜ BerylBe3Al2(Si6O18)
Siβ“˜ ClinochloreMg5Al(AlSi3O10)(OH)8
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ PrehniteCa2Al2Si3O10(OH)2
Siβ“˜ QuartzSiO2
Siβ“˜ SillimaniteAl2(SiO4)O
Siβ“˜ Quartz var. Smoky QuartzSiO2
Siβ“˜ TopazAl2(SiO4)(F,OH)2
Siβ“˜ Garnet GroupX3Z2(SiO4)3
KPotassium
Kβ“˜ MicroclineK(AlSi3O8)
CaCalcium
Caβ“˜ PrehniteCa2Al2Si3O10(OH)2
FeIron
Feβ“˜ MagnetiteFe2+Fe23+O4
BiBismuth
Biβ“˜ Bismutite(BiO)2CO3

Localities in this Region

USA

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, J. F. (1931), The Minerals of Connecticut. State Geological and Natural History Survey Bulletin 51.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 261.
Dorothy M. Schlegal (1957) Gem Stones of the United States :USGS Bulletin 1042-G
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