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Hazen quarry (Epidote locality), Haddam, Middlesex Co., Connecticut, USAi
Regional Level Types
Hazen quarry (Epidote locality)Quarry
Haddam- not defined -
Middlesex Co.County

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Latitude & Longitude (WGS84):
41° 28' 34'' North , 72° 31' 21'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
Higganum1,698 (2017)3.7km
East Haddam9,042 (2017)5.7km
Moodus1,413 (2017)6.7km
Chester Center1,558 (2017)10.1km
East Hampton2,691 (2017)11.2km

A calc-silicate and calcite/dolomite layer in the Collins Hill Formation, adjacent to a pegmatite, that produced excellent epidote crystals in the 19th century. A crude 1845 map of Haddam includes the word "Eppidot" near its location.

Davis (1901) provides this description:

found on the farm of Dr. M. C. Hazen about three-quarters of a mile west, from the Courthouse, where it is very abundant, occurring in a vein of smoky quartz, having for walls Epidosyte rock, it also penetrates into an adjoining feldspar rock, but lacks the brilliancy of color of those crystals found in the smoky quartz.. Nathaniel Cook obtained many beautiful specimens here, some crystals doubly-terminated and six inches long, with brilliant faces and rich color. The color at this locality is particularly fine and many of the smaller crystals are transparent...There is a fissure here extending an unknown distance into the earth, partially filled with water, which remains at a constant height. This has undoubtedly been formed by the action of water

Foye (1922) gives this description of the site:

Following the pegmatite ridge southward the Haddam epidote locality is reached. (Locality 12). A number of old collections have well crystallized specimens of clear epidote from this opening. There is a blast hole at the foot of a steep slope facing toward the east where the pegmatite dike dips beneath the meadow. With pick and shovel the moss and rubble were removed, and a limestone was disclosed in contact with the pegmatite. At the contact the limestone is transformed to epidote and garnet. Pockets of the more finely crystallized epidote are included in the more massive material. There have been no transparent crystals found at the locality for a number of years.

Schooner (1958) writes that:

Dolomite is an unexpected mineral in the Haddam area; yet, as a matter of fact, it comprises a considerable bed of marble, underlying a ridge of pegmatite, at the old epidote locality. It is coarsely crystalline, white in color, and practically free of visible impurities. A natural water-worn “cave”, too small for human passage, and filled with drainage from the hill, extends into the bed of marble from a small pit which was once excavated at the site by a former owner.

Epidote crystals of superb quality have come from the locality in Haddam, just described. Such crystals, as seen in museums, are tabular in habit and of a good green color. Some are as much as three inches across. The matrix is white quartz. Most of the epidote is granular and forms a layer, perhaps a foot thick, at the contact between the dolomitic marble and the pegmatite. Grayish-green hornblende and reddish grossularite are associated.

Under the entry for grossular, he states that:

Gem quality cinnamon garnet may possibly exist at the epidote locality in Haddam; certainly, a few examples from there would give that impression. They are flawed, but otherwise of very good appearance.

Schooner (1961) reports that vesuvianite is present as "brown columnar masses, with grossularite and epidote".

The locality is now covered over and its exact location a little uncertain, so the map reference coordinates given below are approximate.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

11 valid minerals.

Detailed Mineral List:

Formula: Na(AlSi3O8)
Colour: white
Fluorescence: pale blue
Description: massive material
Reference: Harold Moritz collection
Formula: CaCO3
Reference: Davis, James W. (1901): The Minerals of Haddam, Conn. Mineral Collector, v. 8, no. 4, pp. 50-54, and no. 5, pp. 65-70.
Formula: CaMgSi2O6
Habit: elongated grains
Colour: green
Description: small subhedral grains
Reference: Harold Moritz collection
Formula: CaMg(CO3)2
Reference: Schooner, Richard. (1958) THE MINERALOGY OF THE PORTLAND-EAST HAMPTON-MIDDLETOWN-HADDAM AREA IN CONNECTICUT (With a few notes on Glastonbury and Marlborough)
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Habit: elongated prisms
Colour: pale green
Description: Reportedly one of the better localities in Conn., Davis (1901) says: "some crystals doubly-terminated and six inches long, with brilliant faces and rich color. The color at this locality is particularly fine and many of the smaller crystals are transparent"
Reference: Rocks & Minerals (1995) 70:396-409; Davis, James W. (1901): The Minerals of Haddam, Conn. Mineral Collector, v. 8, no. 4, pp. 50-54, and no. 5, pp. 65-70.; Foye, Wilbur G. (1922): Mineral localities in the vicinity of Middletown. American Mineralogist v. 7, p. 4-12.
Formula: Ca3Al2(SiO4)3
Habit: dodecahedral
Colour: reddish-brown, orange-brown
Description: Good crystals to several cm.
Reference: Davis, James W. (1901): The Minerals of Haddam, Conn. Mineral Collector, v. 8, no. 4, pp. 50-54, and no. 5, pp. 65-70.
Formula: Ca4Al6Si6O24CO3
Reference: Rocks & Minerals (1995) 70:396-409
Formula: {Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Reference: Davis, James W. (1901): The Minerals of Haddam, Conn. Mineral Collector, v. 8, no. 4, pp. 50-54, and no. 5, pp. 65-70.; Rocks & Minerals (1995) 70:396-409
Formula: SiO2
Habit: anhedral massive
Colour: milky to smoky
Reference: Harold Moritz collection
Formula: CaTi(SiO4)O
Reference: Rocks & Minerals (1995) 70:396-409
Formula: (Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Colour: greenish-brown
Reference: Rocks & Minerals (1995) 70:396-409

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates
Group 9 - Silicates

List of minerals arranged by Dana 8th Edition classification

Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
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
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)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Unclassified Minerals, Mixtures, etc.

List of minerals for each chemical element

H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
H Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
B Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
C MeioniteCa4Al6Si6O24CO3
C DolomiteCaMg(CO3)2
C CalciteCaCO3
O GrossularCa3Al2(SiO4)3
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O MeioniteCa4Al6Si6O24CO3
O Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
O TitaniteCaTi(SiO4)O
O DolomiteCaMg(CO3)2
O CalciteCaCO3
O Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
O AlbiteNa(AlSi3O8)
O DiopsideCaMgSi2O6
O QuartzSiO2
F Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Na MeioniteCa4Al6Si6O24CO3
Na Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Na AlbiteNa(AlSi3O8)
Mg DolomiteCaMg(CO3)2
Mg Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Mg DiopsideCaMgSi2O6
Al GrossularCa3Al2(SiO4)3
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al MeioniteCa4Al6Si6O24CO3
Al Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Al Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Al AlbiteNa(AlSi3O8)
Si GrossularCa3Al2(SiO4)3
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si MeioniteCa4Al6Si6O24CO3
Si Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Si TitaniteCaTi(SiO4)O
Si Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Si AlbiteNa(AlSi3O8)
Si DiopsideCaMgSi2O6
Si QuartzSiO2
S MeioniteCa4Al6Si6O24CO3
Cl MeioniteCa4Al6Si6O24CO3
Ca GrossularCa3Al2(SiO4)3
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca MeioniteCa4Al6Si6O24CO3
Ca Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Ca TitaniteCaTi(SiO4)O
Ca DolomiteCaMg(CO3)2
Ca CalciteCaCO3
Ca Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Ca DiopsideCaMgSi2O6
Ti TitaniteCaTi(SiO4)O
Mn Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Map of Haddam (1845), Haddam Historical Society, Thankful Arnold House, Haddam.
Davis, James W. (1901), The Minerals of Haddam, Conn. Mineral Collector, v. 8, no. 4, pp. 50-54, and no. 5, pp. 65-70.
Foye, W. G., (1922), Mineral Localities in the Vicinity of Middletown, Connecticut. American Mineralogist: 7: 4-12.
Schooner, Richard. (1958), The Mineralogy of the Portland-East Hampton-Middletown-Haddam Area in Connecticut (With a few notes on Glastonbury and Marlborough). Published by Richard Schooner; Ralph Lieser of Pappy’s Beryl Shop, East Hampton; and Howard Pate of Fluorescent House, Branford, Connecticut.
Schooner, Richard. (1961), The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 403.

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