Club	Location	Distance
Bristol Gem & Mineral Club	Bristol, Connecticut	13km
Lapidary and Mineral Society of Central Connecticut	Meriden, Connecticut	21km
Connecticut Valley Mineral Club	Springfield, Massachusetts	46km
New Haven Mineral Club	New Haven, Connecticut	47km

Mindat Locality ID:

205501

Long-form identifier:

mindat:1:2:205501:8

GUID (UUID V4):

1e302caa-b90a-42c7-9543-82b7b7234343

Road cut on north side of state Route 4 exposing both the early Jurassic Talcott Basalt and underlying Triassic New Haven Arkose. Minerals occur mostly in the interstitial spaces between lava pillows in the Talcott; green secondary copper mineralization is visible in the arkose, with malachite formed along the bedding planes. The basalt exposed in the "jug handle" part of the interchange and the small commuter parking lot east of the cut is the Jurassic Holyoke Basalt, which is not mineralized here. A fault separates the two basalt flows here, with the normally intervening Jurassic Shuttle Meadow formation missing.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

11 valid minerals.

Detailed Mineral List:

ⓘ 'Axinite Group' ?

Description: ??? Must be a mistake in the reference as this mineral is not known from any basalt exposure in the region.

References:

Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 398.

ⓘ Calcite

Formula: CaCO₃

References:

Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 398.

ⓘ Celestine

Formula: SrSO₄

Habit: blocky subhedral

Colour: pale blue

Description: crystals partly filling a void in a quartz crystal lining

References:

Moritz, Harold (n.d.) Personal Communication.

ⓘ Chalcopyrite

Formula: CuFeS₂

References:

Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 398.

ⓘ Chrysocolla

Formula: Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1

Habit: massive encrustations

Colour: blue-green

Description: secondary crusts on fractures, bedding planes and between sand grains in the arkose below the lava.

References:

Moritz, Harold (n.d.) Personal Communication.

✪ Datolite

Formula: CaB(SiO₄)(OH)

Habit: stubby complex prisms

Colour: white to pale green

Description: Crystal can be gemmy and up to 2-3 cm.

References:

Moritz, Harold (n.d.) Personal Communication.

ⓘ Ferrosaponite ?

Formula: Ca_0.3(Fe²⁺,Mg,Fe³⁺)₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂O

Habit: platy globules

Colour: dark greenish black

Description: As platy globules 1-2 mm on datolite.

References:

Moritz, Harold (n.d.) Personal Communication.

ⓘ Gypsum

Formula: CaSO₄ · 2H₂O

Habit: tabular, crusts

Colour: white

Description: thin encrusting crystals with malachite on bedding planes in the arkose below the lava.

References:

Moritz, Harold (n.d.) Personal Communication.

ⓘ Hematite

Formula: Fe₂O₃

Habit: encrustations

Colour: reddish brown

Description: reddish coatings on fractures in the lava.

References:

Moritz, Harold (n.d.) Personal Communication.

ⓘ 'K Feldspar'

References:

Moritz, Harold (n.d.) Personal Communication.

ⓘ 'K Feldspar var. Adularia'

Formula: KAlSi₃O₈

Colour: off white

Description: As a thin crust on prehnite botryoids with datolite.

References:

Moritz, Harold (n.d.) Personal Communication.

ⓘ Malachite

Formula: Cu₂(CO₃)(OH)₂

Habit: thin films to acicular

Colour: green

Description: As thin green films and stains with white gypsum in the uppermost New Haven Arkose just below the lava flow.

References:

Moritz, Harold (n.d.) Personal Communication.

ⓘ Prehnite

Formula: Ca₂Al₂Si₃O₁₀(OH)₂

References:

Collection of Mark A Gottlieb

Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 398.

ⓘ 'Pumpellyite Subgroup'

Formula: Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A

References:

Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 398.

ⓘ Quartz

Formula: SiO₂

Habit: short prismatic druse

Colour: colorless to amethystine

Description: Parallel growth crystals lining a void between lava pillows enclosing celestine

References:

Moritz, Harold (n.d.) Personal Communication.

Gallery:

SrSO₄ⓘ Celestine

CaB(SiO₄)(OH)ⓘ Datolite

Ca₂Al₂Si₃O₁₀(OH)₂ⓘ Prehnite

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
Group 4 - Oxides and Hydroxides
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	Quartz	4.DA.05	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Malachite	5.BA.10	Cu₂(CO₃)(OH)₂
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Celestine	7.AD.35	SrSO₄
ⓘ	Gypsum	7.CD.40	CaSO₄ · 2H₂O
Group 9 - Silicates
ⓘ	Datolite	9.AJ.20	CaB(SiO₄)(OH)
ⓘ	Prehnite	9.DP.20	Ca₂Al₂Si₃O₁₀(OH)₂
ⓘ	Ferrosaponite ?	9.EC.45	Ca_0.3(Fe²⁺,Mg,Fe³⁺)₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂O
ⓘ	Chrysocolla	9.ED.20	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
Unclassified
ⓘ	'K Feldspar var. Adularia'	-	KAlSi₃O₈
ⓘ	'Pumpellyite Subgroup'	-	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
ⓘ	'K Feldspar'	-
ⓘ	'Axinite Group' ?	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
H	ⓘ Datolite	CaB(SiO₄)(OH)
H	ⓘ Gypsum	CaSO₄ · 2H₂O
H	ⓘ Malachite	Cu₂(CO₃)(OH)₂
H	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
H	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
H	ⓘ Ferrosaponite	Ca_0.3(Fe²⁺,Mg,Fe³⁺)₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂O
B	Boron
B	ⓘ Datolite	CaB(SiO₄)(OH)
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Malachite	Cu₂(CO₃)(OH)₂
O	Oxygen
O	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
O	ⓘ Calcite	CaCO₃
O	ⓘ Celestine	SrSO₄
O	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
O	ⓘ Datolite	CaB(SiO₄)(OH)
O	ⓘ Gypsum	CaSO₄ · 2H₂O
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Malachite	Cu₂(CO₃)(OH)₂
O	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
O	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
O	ⓘ Quartz	SiO₂
O	ⓘ Ferrosaponite	Ca_0.3(Fe²⁺,Mg,Fe³⁺)₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂O
Mg	Magnesium
Mg	ⓘ Ferrosaponite	Ca_0.3(Fe²⁺,Mg,Fe³⁺)₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂O
Al	Aluminium
Al	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
Al	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
Al	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Al	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Al	ⓘ Ferrosaponite	Ca_0.3(Fe²⁺,Mg,Fe³⁺)₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂O
Si	Silicon
Si	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
Si	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
Si	ⓘ Datolite	CaB(SiO₄)(OH)
Si	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Si	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Si	ⓘ Quartz	SiO₂
Si	ⓘ Ferrosaponite	Ca_0.3(Fe²⁺,Mg,Fe³⁺)₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂O
S	Sulfur
S	ⓘ Celestine	SrSO₄
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Gypsum	CaSO₄ · 2H₂O
K	Potassium
K	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Datolite	CaB(SiO₄)(OH)
Ca	ⓘ Gypsum	CaSO₄ · 2H₂O
Ca	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Ca	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Ca	ⓘ Ferrosaponite	Ca_0.3(Fe²⁺,Mg,Fe³⁺)₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂O
Fe	Iron
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Hematite	Fe₂O₃
Fe	ⓘ Ferrosaponite	Ca_0.3(Fe²⁺,Mg,Fe³⁺)₃((Si,Al)₄O₁₀)(OH)₂ · 4H₂O
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂
Cu	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
Cu	ⓘ Malachite	Cu₂(CO₃)(OH)₂
Sr	Strontium
Sr	ⓘ Celestine	SrSO₄

Other Regions, Features and Areas containing this locality

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References

Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 398.

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State Route 4 road cut, Farmington, Hartford County, Connecticut, USAiRegional Level TypesState Route 4 road cutRoad Cutting FarmingtonTown Hartford CountyCounty ConnecticutState USACountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Mineral List

Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Regions, Features and Areas containing this locality

References

State Route 4 road cut, Farmington, Hartford County, Connecticut, USA i
Regional Level Types
State Route 4 road cut Road Cutting
Farmington Town
Hartford County County
Connecticut State
USA Country