Club	Location	Distance
Bristol Gem & Mineral Club	Bristol, Connecticut	14km
Lapidary and Mineral Society of Central Connecticut	Meriden, Connecticut	21km
Connecticut Valley Mineral Club	Springfield, Massachusetts	45km
New Haven Mineral Club	New Haven, Connecticut	48km

Mindat Locality ID:

238731

Long-form identifier:

mindat:1:2:238731:7

GUID (UUID V4):

f4b11804-ef0e-4a59-bdd4-91f49ba7012c

An old quarry in the early Jurassic Talcott Basalt excavated from an undetermined time until the early 1930s. From the 1930s until circa 1970, the quarry pit was filled with municipal solid waste. This is likely the locality for many old specimens just attributed to "Farmington" as it predates the modern state Route 4 road cut nearby and the Tilcon quarry on US Route 6. The basalt here is a pillow lava, which is exposed just to the south on state Route 4. The matrix for specimens from here will show greenish alteration and curved pillow surfaces. The other Farmington trap rock quarry on US Route 6 (Tilcon) is in dense Holyoke Basalt.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

9 valid minerals.

Detailed Mineral List:

ⓘ Aragonite

Formula: CaCO₃

References:

Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.

ⓘ Baryte

Formula: BaSO₄

References:

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

✪ Calcite

Formula: CaCO₃

Habit: rhombohedral

Colour: yellow

Description: small, yellow, transparent xls of calcite which were nearly cubic in form (Bartsch, 1940).

References:

Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals, vol. 15, no. 8, p. 274.

ⓘ 'Chabazite'

References:

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ Chalcopyrite

Formula: CuFeS₂

References:

Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.

ⓘ 'Chlorite Group'

References:

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ Datolite

Formula: CaB(SiO₄)(OH)

References:

Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.

ⓘ Hematite

Formula: Fe₂O₃

Habit: Coatings

Colour: Red-brown

Description: Red-brown coatings on fractures.

References:

Eric Quinter collection

✪ Heulandite-Ca

Formula: (Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O

Habit: coffin-shaped aggregates

Colour: cream

Description: Crystal aggregates to at least 2 cm found with other minerals in voids in basalt. Species ID based on multiple analysis of similar crystals from around the state, all of which are heulandite-Ca.

References:

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

✪ Prehnite

Formula: Ca₂Al₂Si₃O₁₀(OH)₂

Habit: botryoidal aggregates

Colour: pale green

References:

Zodac, Peter. (1938), Prehnite. Rocks & Minerals: 13(5): 131.

Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals, vol. 15, no. 8, p. 274

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ Quartz

Formula: SiO₂

References:

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ Quartz var. Amethyst

Formula: SiO₂

References:

Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.

ⓘ Quartz var. Chalcedony

Formula: SiO₂

References:

Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.

ⓘ 'Stilbite Subgroup'

Formula: M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O

References:

Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.

Gallery:

CaCO₃ⓘ Calcite

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 var. Amethyst	4.DA.05	SiO₂
ⓘ	var. Chalcedony	4.DA.05	SiO₂
ⓘ		4.DA.05	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Aragonite	5.AB.15	CaCO₃
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Baryte	7.AD.35	BaSO₄
Group 9 - Silicates
ⓘ	Datolite	9.AJ.20	CaB(SiO₄)(OH)
ⓘ	Prehnite	9.DP.20	Ca₂Al₂Si₃O₁₀(OH)₂
ⓘ	Heulandite-Ca	9.GE.05	(Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O
Unclassified
ⓘ	'Chabazite'	-
ⓘ	'Chlorite Group'	-
ⓘ	'Stilbite Subgroup'	-	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Datolite	CaB(SiO₄)(OH)
H	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
H	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
H	ⓘ Heulandite-Ca	(Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O
B	Boron
B	ⓘ Datolite	CaB(SiO₄)(OH)
C	Carbon
C	ⓘ Aragonite	CaCO₃
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Quartz var. Amethyst	SiO₂
O	ⓘ Aragonite	CaCO₃
O	ⓘ Baryte	BaSO₄
O	ⓘ Calcite	CaCO₃
O	ⓘ Quartz var. Chalcedony	SiO₂
O	ⓘ Datolite	CaB(SiO₄)(OH)
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
O	ⓘ Quartz	SiO₂
O	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
O	ⓘ Heulandite-Ca	(Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O
Na	Sodium
Na	ⓘ Heulandite-Ca	(Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O
Al	Aluminium
Al	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Al	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Al	ⓘ Heulandite-Ca	(Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O
Si	Silicon
Si	ⓘ Quartz var. Amethyst	SiO₂
Si	ⓘ Quartz var. Chalcedony	SiO₂
Si	ⓘ Datolite	CaB(SiO₄)(OH)
Si	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Si	ⓘ Quartz	SiO₂
Si	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Si	ⓘ Heulandite-Ca	(Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O
S	Sulfur
S	ⓘ Baryte	BaSO₄
S	ⓘ Chalcopyrite	CuFeS₂
Ca	Calcium
Ca	ⓘ Aragonite	CaCO₃
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Datolite	CaB(SiO₄)(OH)
Ca	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Ca	ⓘ Heulandite-Ca	(Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O
Fe	Iron
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Hematite	Fe₂O₃
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂
Ba	Barium
Ba	ⓘ Baryte	BaSO₄

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

Ganderia DomainDomain

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References

Schairer, John F. (1931): Minerals of Connecticut. State Geological and Natural History Survey of Connecticut Bulletin 51.

Zodac, Peter. (1938), Prehnite. Rocks & Minerals: 13(5): 131.

Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals: 15(8): 274.

Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.

Januzzi, Ron E., Seaman, David M. (1976) Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut, USA.

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

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