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Kyanite locality (Judds Bridge locality), Washington, Litchfield Co., Connecticut, USAi
Regional Level Types
Kyanite locality (Judds Bridge locality)- not defined -
Washington- not defined -
Litchfield Co.County
ConnecticutState
USACountry

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Key
Latitude & Longitude (WGS84):
41° 35' 56'' North , 73° 20' 11'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Washington3,466 (2017)4.2km
New Milford6,523 (2017)6.5km
New Preston1,182 (2017)8.6km
Bethlehem Village2,021 (2017)12.0km
Woodbury9,755 (2017)12.2km


The kyanite locality is in the southern part of the Steep Rock Association preserve, along the power lines. It is about 50 meters east of the wooden power line pylon nearest the old railroad bed, adjacent to a small, sloping outcrop of schist. The main opening is a partly flooded pit at the foot of the schist outcrop. The pit is about 6 meters square and is flanked by dumps up to about 1 meter high. The degree of work indicates it was opened long ago with heavy equipment.

Although it is in the Town of Washington, the closest village is Judd's Bridge, which is a little further south in the Town of Roxbury. Kyanite from "Judd's Bridge" appears to be first mentioned by Schairer (1931). Earlier documents may mention minerals occurring in the town of Washington but give no specific locality nor mention the name Judd's Bridge. Januzzi (1959) provides the most details on the minerals from the kyanite locality, later works mostly repeat his list or paraphrase his text.

Januzzi (1959) also documents a hydrothermal vein at "a new locality near Judd’s Bridge" that hosts sulfides in calcite and quartz. His later documents (1976 and 1994) do not include these minerals in his list for the kyanite locality, so the hydrothermal vein appears to be a separate place, its exact location undocumented.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


16 valid minerals.

Detailed Mineral List:

Andalusite
Formula: Al2(SiO4)O
Description: "E. S. Dana reported that good crystals of andalusite could be found altered to kyanite and mica at Judd’s Bridge" (Januzzi, 1994).
Reference: Januzzi, Ronald E. and David Seaman. (1976): Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut.; Januzzi, Ronald E. (1994): Mineral Data Book - Western Connecticut and Environs. Mineralogical Press, Danbury, Connecticut.
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Description: anhedral grains in the host schist
Reference: Januzzi, Ronald E. and David Seaman (1976): Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut.
Calcite
Formula: CaCO3
Habit: massive
Description: Gangue host in a hydrothermal vein "At a new locality near Judd’s Bridge" discovered by Januzzi circa 1959, with quartz, galena, sphalerite, pyrrhotite, pyrite. He does not state that it is the same place as the kyanite locality.
Reference: Januzzi, Ronald E. and David Seaman (1976): Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut.; Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. The Mineralogical Press, Danbury, Connecticut.
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Habit: fine anhedral grains
Colour: dark green
Description: Forms fine-grained masses at the contact between the quartz mass and the host schist.
Reference: American Museum of Natural History display
Clinochlore var: Ripidolite
Formula: (Mg,Fe,Al)6(Si,Al)4O10(OH)8
Habit: fine anhedral grains
Colour: dark green
Description: Forms fine-grained masses at the contact between the quartz mass and the host schist.
Reference: American Museum of Natural History display
Corundum ?
Formula: Al2O3
Description: Januzzi (1959) states "Corundum has been reported from the Judd’s Bridge kyanite locality at Washington, Connecticut, or in the near vicinity by J. D. Dana." Dana's System of Mineralogy only references the town, not the specific locality, which does not appear in print until Schairer, 1931. All references after Januzzi (1959) provide no confirmation, but merely repeat his list of minerals or paraphrase the quoted text.
Reference: Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.; Januzzi, Ronald E. (1976): The Mineral Localities of Connecticut and Southeastern New York State. Mineralogical Press, Danbury, Connecticut.
Fluorapatite
Formula: Ca5(PO4)3F
Colour: pale to medium green
Description: "Crude, pale green crystals and masses occur in quartz", Januzzi, 1959.
Reference: Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.; Januzzi, Ronald E. (1976): The Mineral Localities of Connecticut and Southeastern New York State. Mineralogical Press, Danbury, Connecticut.
Galena
Formula: PbS
Description: "rich masses" in a hydrothermal vein "At a new locality near Judd’s Bridge" discovered by Januzzi circa 1959, with calcite, quartz, sphalerite, pyrrhotite, pyrite. He does not state that it is the same place as the kyanite locality, in fact his 1976 and 1994 publications do not include these minerals in his list for the Judd's Bridge kyanite locality, so it appears to be a separate place, specific location undocumented.
Reference: Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.
Greenockite
Formula: CdS
Description: "One specimen of this mineral found in western Connecticut occurred as an alteration of sphalerite at the new locality discovered by the author at Judd’s Bridge" (Januzzi 1959). With calcite, quartz, galena, pyrite, pyrrhotite in a hydrothermal vein. He does not state that it is the same place as the kyanite locality, in fact his 1976 and 1994 publications do not include these minerals in his list for the Judd's Bridge kyanite locality, so it appears to be a separate place, specific location undocumented.
Reference: Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.
Ilmenite
Formula: Fe2+TiO3
Habit: tabular
Colour: black
Description: "commonly associated with kyanite at Judd’s Bridge.", Januzzi, 1959.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), Vol. 70, No. 6, p. 399.; Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.; Januzzi, Ronald E. (1976): The Mineral Localities of Connecticut and Southeastern New York State. Mineralogical Press, Danbury, Connecticut.
Kyanite
Formula: Al2(SiO4)O
Habit: elongated, flattened prisms and subparallel aggregates
Colour: blue
Description: As beautiful blue, bladed crystals and crystal aggregates in milky quartz veins and in host schist associated with ilmenite, staurolite, apatite, and damourite plus the host schist's rock-forming minerals. Blades can be singles or in subparallel aggregates, reaching about 15 cm long and 2-3 cm wide.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), Vol. 70, No. 6, p. 399.; Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.; Januzzi, Ronald E. (1976): The Mineral Localities of Connecticut and Southeastern New York State. Mineralogical Press, Danbury, Connecticut.; Schairer. 1931: Minerals of Connecticut; Schairer, John F. (1931): Minerals of Connecticut. State Geological and Natural History Survey of Connecticut Bulletin 51.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Januzzi, Ronald E. (1976): The Mineral Localities of Connecticut and Southeastern New York State. Mineralogical Press, Danbury, Connecticut.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Januzzi, Ronald E. (1976): The Mineral Localities of Connecticut and Southeastern New York State. Mineralogical Press, Danbury, Connecticut.
Muscovite var: Damourite
Formula: KAl2(AlSi3O10)(OH)2
Habit: anhedral scales, pseudomorphs after kyanite
Description: "as pearly scales in quartz and as more compact talc-like masses that are apparently pseudomorphs after kyanite", Januzzi, 1959.
Reference: Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.; Januzzi, Ronald E. (1976): The Mineral Localities of Connecticut and Southeastern New York State. Mineralogical Press, Danbury, Connecticut.
Pyrite
Formula: FeS2
Description: In a hydrothermal vein "At a new locality near Judd’s Bridge" discovered by Januzzi circa 1959, with calcite, quartz, sphalerite, pyrrhotite, galena. He does not state that it is the same place as the kyanite locality, in fact his 1976 and 1994 publications do not include these minerals in his list for the Judd's Bridge kyanite locality, so it appears to be a separate place, specific location undocumented.
Reference: Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.
Pyrrhotite
Formula: Fe7S8
Description: "At a new locality near Judd’s Bridge the author found small pyrrhotite crystals that showed a wide range of crystal forms. It was associated with other sulfides such as pyrite, sphalerite, galena and with quartz and calcite." Januzzi, 1959. He does not state that it is the same place as the kyanite locality, in fact his 1976 and 1994 publications do not include these minerals in his list for the Judd's Bridge kyanite locality, so it appears to be a separate place, specific location undocumented.
Reference: Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.
Quartz
Formula: SiO2
Description: At the kyanite locality - as massive white veins hosting the kyanite. As a gangue in the hydrothermal vein reported by Januzzi (1959).
Reference: Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.
Sphalerite
Formula: ZnS
Description: In a hydrothermal vein "At a new locality near Judd’s Bridge" discovered by Januzzi circa 1959, with calcite, quartz, galena, pyrrhotite, pyrite. He does not state that it is the same place as the kyanite locality, in fact his 1976 and 1994 publications do not include these minerals in his list for the Judd's Bridge kyanite locality, so it appears to be a separate place, specific location undocumented.
Reference: Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.
Staurolite
Formula: Fe2+2Al9Si4O23(OH)
Habit: prismatic
Colour: dark brown
Description: Prismatic crystals to 4 cm in host schist (hiding under lumps in the foliation), but typically partially altered to chlorite and mica and so do not make good specimens.
Reference: Januzzi, Ronald E. and David Seaman. (1976): Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut.; Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 399.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Galena2.CD.10PbS
Greenockite2.CB.45CdS
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Corundum ?4.CB.05Al2O3
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
Andalusite9.AF.10Al2(SiO4)O
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
var: Ripidolite9.EC.55(Mg,Fe,Al)6(Si,Al)4O10(OH)8
Kyanite9.AF.15Al2(SiO4)O
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Damourite9.EC.15KAl2(AlSi3O10)(OH)2
Staurolite9.AF.30Fe2+2Al9Si4O23(OH)
Unclassified Minerals, Rocks, etc.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Greenockite2.8.7.2CdS
Pyrrhotite2.8.10.1Fe7S8
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Corundum ?4.3.1.1Al2O3
Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
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
Andalusite52.2.2b.1Al2(SiO4)O
Kyanite52.2.2c.1Al2(SiO4)O
Staurolite52.2.3.1Fe2+2Al9Si4O23(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Clinochlore
var: Ripidolite
-(Mg,Fe,Al)6(Si,Al)4O10(OH)8
Muscovite
var: Damourite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H Muscovite (var: Damourite)KAl2(AlSi3O10)(OH)2
H StauroliteFe22+Al9Si4O23(OH)
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
H MuscoviteKAl2(AlSi3O10)(OH)2
H ClinochloreMg5Al(AlSi3O10)(OH)8
CCarbon
C CalciteCaCO3
OOxygen
O KyaniteAl2(SiO4)O
O AndalusiteAl2(SiO4)O
O Muscovite (var: Damourite)KAl2(AlSi3O10)(OH)2
O IlmeniteFe2+TiO3
O MagnetiteFe2+Fe23+O4
O StauroliteFe22+Al9Si4O23(OH)
O CalciteCaCO3
O FluorapatiteCa5(PO4)3F
O QuartzSiO2
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
O MuscoviteKAl2(AlSi3O10)(OH)2
O ClinochloreMg5Al(AlSi3O10)(OH)8
O CorundumAl2O3
FFluorine
F FluorapatiteCa5(PO4)3F
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
MgMagnesium
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Mg Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
AlAluminium
Al KyaniteAl2(SiO4)O
Al AndalusiteAl2(SiO4)O
Al Muscovite (var: Damourite)KAl2(AlSi3O10)(OH)2
Al StauroliteFe22+Al9Si4O23(OH)
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al CorundumAl2O3
SiSilicon
Si KyaniteAl2(SiO4)O
Si AndalusiteAl2(SiO4)O
Si Muscovite (var: Damourite)KAl2(AlSi3O10)(OH)2
Si StauroliteFe22+Al9Si4O23(OH)
Si QuartzSiO2
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si ClinochloreMg5Al(AlSi3O10)(OH)8
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S SphaleriteZnS
S GreenockiteCdS
S PyrrhotiteFe7S8
S GalenaPbS
S PyriteFeS2
KPotassium
K Muscovite (var: Damourite)KAl2(AlSi3O10)(OH)2
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
Ca FluorapatiteCa5(PO4)3F
TiTitanium
Ti IlmeniteFe2+TiO3
FeIron
Fe PyrrhotiteFe7S8
Fe IlmeniteFe2+TiO3
Fe MagnetiteFe2+Fe23+O4
Fe StauroliteFe22+Al9Si4O23(OH)
Fe PyriteFeS2
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
ZnZinc
Zn SphaleriteZnS
CdCadmium
Cd GreenockiteCdS
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Schairer, John F. (1931): Minerals of Connecticut. State Geological and Natural History Survey of Connecticut Bulletin 51.
Elwell, Wilbur J. (1936): Mineral Collecting by Hydroplane. Rocks and Minerals: 11(6): 92-3.
Jones, Robert W. Jr., (1960): Luminescent Minerals of Connecticut, A Guide to Their Properties and Locations. Fluorescent House. Branford, Connecticut.
Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Ryerson, Kathleen H. (1976): Rock Hound’s Guide to Connecticut. Pequot Press.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 399.
Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. Mineralogical Press, Danbury, Connecticut.
Januzzi, Ronald E. (1976): The Mineral Localities of Connecticut and Southeastern New York State. Mineralogical Press, Danbury, Connecticut.
Januzzi, Ronald E. (1994): Mineral Data Book - Western Connecticut and Environs. Mineralogical Press, Danbury, Connecticut.

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