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State Route 8, Thomaston, Litchfield Co., Connecticut, USAi
Regional Level Types
State Route 8- not defined -
Thomaston- not defined -
Litchfield Co.County
ConnecticutState
USACountry

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Key
Latitude & Longitude (WGS84):
41° North , 73° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~4km


Construction of state Route 8 through town in the late 1950s uncovered two areas of mineralization preserved in collections, but poorly described.

Of particular note is a calc-silicate assemblage rich in axinite-(Fe), a very rare mineral in Connecticut. Schooner (1961) reports that this was found "in the area around Thomaston Dam" but clearly not at the railroad cut just west of the dam. Yale Peabody Museum has two specimens of it that are cataloged as coming from an unspecified Route 8 road cut. Another specimen (https://www.mindat.org/photo-997893.html) is labeled as coming from a road cut north of Thomaston. I assume it is the large cut where Routes 8 and 222 intersect, which is where one would exit the highway to drive to the dam. There are some other cuts along the highway further north.

An area rich in stilbite is represented by several specimens in the Yale Peabody Museum collection and other private collections. The YPM catalog gives their location as a road cut 1 mile south of Thomaston. Assuming this means south of downtown (otherwise the locality would be in Watertown), the large cut on the east side of the hill at Reynolds Bridge (just south of the interchange with state Route 109) seems the only likely place.

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Mineral List


12 valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2
Colour: green
Description: In a calc-silicate lens with intergrown albite, epidote, diopside, axinite-(Fe), clinozoisite, titanite, rutile.
Reference: Schooner, Richard. (1961) The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Albite
Formula: Na(AlSi3O8)
Reference: Schooner, Richard. (1961) The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Axinite-(Fe)
Formula: Ca2Fe2+Al2BSi4O15OH
Habit: "small plates and confused aggregates" (Schooner, 1961)
Colour: pale lavender-gray
Description: Intergrown with albite, epidote, diopside, actinolite, clinozoisite, and titanite w/accessory rutile, apparently from a calc-silicate lens. Yale Peabody Museum has two similar specimens labeled as coming from a Route 8 road cut. Another specimen has a label saying it is from a roadcut north of Thomaston, perhaps the large cuts at the intersection of Routes 8 and 222. Schooner (1961) says the assemblage was "found in the area around the Thomaston Dam" and that "some excellent specimens" were obtained. Clear microcrystals are present in little voids between the massive axinite plates.
Reference: Schooner, Richard. (1961) The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Calcite
Formula: CaCO3
Habit: scalenohedral
Colour: white
Fluorescence: pink
Description: Translucent, doubly-terminated crystals typically <1 cm, with orange-yellow stilbite.
Reference: Harold Moritz collection
Clinozoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Habit: masses of elongated crystals
Colour: clove brown
Description: In a calc-silicate lens with intergrown albite, actinolite, axinite-(Fe), diopside, epidote, titanite, rutile.
Reference: Schooner, Richard. (1961) The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Diopside
Formula: CaMgSi2O6
Description: In a calc-silicate lens in the schist with intergrown albite, actinolite, axinite-(Fe), clinozoisite, epidote, titanite, rutile.
Reference: Schooner, Richard. (1961) The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Habit: massive
Colour: olive green
Description: In a calc-silicate lens in the schist with intergrown albite, actinolite, axinite-(Fe), clinozoisite, titanite, rutile.
Reference: Former Ed Force collection
Pyrite
Formula: FeS2
Reference: Harold Moritz collection
Quartz
Formula: SiO2
Reference: Harold Moritz collection
Rutile
Formula: TiO2
Description: In a calc-silicate lens in the schist with intergrown albite, actinolite, axinite-(Fe), diopside, epidote, titanite, clinozoisite.
Reference: Schooner, Richard. (1961) The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
'Stilbite subgroup'
Formula: (Na/Ca/K)6-7[Al8-9Si27-28O72] · nH2O
Habit: bortyoidal to sheaf-like aggregates
Colour: orange-yellow
Description: Aggregates typically around 1 cm.
Reference: Harold Moritz collection
Titanite
Formula: CaTi(SiO4)O
Colour: yellow and light brownish
Description: In a calc-silicate lens in the schist with intergrown albite, actinolite, axinite-(Fe), epidote, diopside, clinozoisite, rutile.
Reference: Schooner, Richard. (1961) The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Zoisite ?
Formula: Ca2Al3[Si2O7][SiO4]O(OH)
Habit: subhedral elongated prismatic
Colour: light gray
Description: Mass of elongated crystals with quartz labeled as "diopside" from this location, but looks more like zoisite but could be clinozoisite. Some edges of the specimen show rounding and weathering suggesting the original find was a glacial cobble rather than rock taken from the road cut.
Reference: Former Ed Force collection

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Actinolite9.DE.10☐Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2
Albite9.FA.35Na(AlSi3O8)
Axinite-(Fe)9.BD.20Ca2Fe2+Al2BSi4O15OH
Clinozoisite9.BG.05a{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Diopside9.DA.15CaMgSi2O6
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Titanite9.AG.15CaTi(SiO4)O
Zoisite ?9.BG.10Ca2Al3[Si2O7][SiO4]O(OH)
Unclassified Minerals, Rocks, etc.
'Stilbite subgroup'-(Na/Ca/K)6-7[Al8-9Si27-28O72] · nH2O

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
AX2
Rutile4.4.1.1TiO2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
Axinite-(Fe)56.2.2.1Ca2Fe2+Al2BSi4O15OH
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Clinozoisite58.2.1a.4{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Zoisite ?58.2.1b.1Ca2Al3[Si2O7][SiO4]O(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
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, Mixtures, etc.
Actinolite-☐Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2
'Stilbite subgroup'-(Na/Ca/K)6-7[Al8-9Si27-28O72] · nH2O

List of minerals for each chemical element

HHydrogen
H Stilbite subgroup(Na/Ca/K)6-7[Al8-9Si27-28O72] · nH2O
H Actinolite☐Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2
H Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
H Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H ZoisiteCa2Al3[Si2O7][SiO4]O(OH)
BBoron
B Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
CCarbon
C CalciteCaCO3
OOxygen
O CalciteCaCO3
O QuartzSiO2
O Stilbite subgroup(Na/Ca/K)6-7[Al8-9Si27-28O72] · nH2O
O AlbiteNa(AlSi3O8)
O DiopsideCaMgSi2O6
O Actinolite☐Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2
O Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
O Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
O TitaniteCaTi(SiO4)O
O RutileTiO2
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O ZoisiteCa2Al3[Si2O7][SiO4]O(OH)
NaSodium
Na Stilbite subgroup(Na/Ca/K)6-7[Al8-9Si27-28O72] · nH2O
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg DiopsideCaMgSi2O6
Mg Actinolite☐Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2
AlAluminium
Al Stilbite subgroup(Na/Ca/K)6-7[Al8-9Si27-28O72] · nH2O
Al AlbiteNa(AlSi3O8)
Al Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Al Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al ZoisiteCa2Al3[Si2O7][SiO4]O(OH)
SiSilicon
Si QuartzSiO2
Si Stilbite subgroup(Na/Ca/K)6-7[Al8-9Si27-28O72] · nH2O
Si AlbiteNa(AlSi3O8)
Si DiopsideCaMgSi2O6
Si Actinolite☐Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2
Si Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Si Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Si TitaniteCaTi(SiO4)O
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si ZoisiteCa2Al3[Si2O7][SiO4]O(OH)
SSulfur
S PyriteFeS2
KPotassium
K Stilbite subgroup(Na/Ca/K)6-7[Al8-9Si27-28O72] · nH2O
CaCalcium
Ca CalciteCaCO3
Ca Stilbite subgroup(Na/Ca/K)6-7[Al8-9Si27-28O72] · nH2O
Ca DiopsideCaMgSi2O6
Ca Actinolite☐Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2
Ca Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Ca Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Ca TitaniteCaTi(SiO4)O
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca ZoisiteCa2Al3[Si2O7][SiO4]O(OH)
TiTitanium
Ti TitaniteCaTi(SiO4)O
Ti RutileTiO2
FeIron
Fe PyriteFeS2
Fe Actinolite☐Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2
Fe Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

References

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Harold Moritz collection, Yale Peabody Museum collection

Other Regions, Features and Areas containing this locality

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