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Hill above the parsonage, Haddam, Middlesex Co., Connecticut, USAi
Regional Level Types
Hill above the parsonage- not defined -
Haddam- not defined -
Middlesex Co.County
ConnecticutState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84): 41° 28' 50'' North , 72° 31' 10'' West
Latitude & Longitude (decimal): 41.48056,-72.51944
GeoHash:G#: drk7vz2cy
Köppen climate type:Cfa : Humid subtropical climate


Williams notes mineralogy on the hill "above the parsonage" near a feldspar quarry. The parsonage was on the south side of Walkley Hill Road just opposite the chrysoberyl locality at the Cephus Brainerd house. Similar minerals occur there (see http://www.mindat.org/loc-213971.html). The land to the south of (back or above) the parsonage slopes steeply upward. No name can be found so far for the feldspar quarry. The bedrock geological map shows N-S trending pegmatites in Ordovician Middletown Formation metavolcanics underlying this area. Coordinates are very approximate given the general descriptions and subsequent residential development of the area that obliterated old exposures and precludes inspection.

Williams (1899): "On the hill back of the Feldspar quarry I have found Chrysoberyl, Beryl, Fahlunite, Molybdenite, and Garnets. About one hundred yards South in a Chlorite Schist, Tourmaline crystals occur."

Williams (circa 1945): "Chrysoberyl occurs on the hill south by west from the old locality [C. Brainerd house], distance about 1500 ft. Chrysoberyl, Garnet, Beryl, Molybdenite in a vein of Pegmatite very much like the old deposit, possibly an extension of the same vein...On the hill south of the Feldspar quarry, large doubly terminated black tourmaline in Chlorite, occur."

Davis (1901) apparently mentions the garnet crystals in this general area also: "About one-half mile southwest from the [Brainerd house chrysoberyl] deposit they occur very abundant in a mica schist. The crystals an seldom perfect, usually only half crystallized, but those faces that are shown are very brilliant and of a rich ruby red color."

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


7 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.
Beryl
Formula: Be3Al2(Si6O18)
Reference: Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.
'Chlorite Group'
Reference: Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.
Chrysoberyl
Formula: BeAl2O4
Reference: Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.
'Fahlunite'
Formula: (Mg,Fe)Al2Si3O10 · 2H2O
Reference: Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.
'Garnet Group'
Formula: X3Z2(SiO4)3
Colour: ruby red
Description: The crystals an seldom perfect, usually only half crystallized, but those faces that are shown are very brilliant and of a rich ruby red color. (Davis, 1901)
Reference: Davis, James W. (1901): The Minerals of Haddam, Connecticut Mineral Collector: 8(4): 50-54, and 8(5): 65-70.
Microcline
Formula: K(AlSi3O8)
Reference: Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.
Molybdenite
Formula: MoS2
Reference: Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.
Quartz
Formula: SiO2
Reference: Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Habit: doublyl-terminated prismatic
Colour: black
Description: "large", embedded in chlorite
Reference: Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Molybdenite'2.EA.30MoS2
Group 4 - Oxides and Hydroxides
'Chrysoberyl'4.BA.05BeAl2O4
Quartz4.DA.05SiO2
Group 9 - Silicates
'Albite'9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
'Beryl'9.CJ.05Be3Al2(Si6O18)
'Microcline'9.FA.30K(AlSi3O8)
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Fahlunite'-(Mg,Fe)Al2Si3O10 · 2H2O
'Garnet Group'-X3Z2(SiO4)3

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Group 7 - MULTIPLE OXIDES
AB2X4
Chrysoberyl7.2.9.1BeAl2O4
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
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)
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Rocks, etc.
Albite
var: Oligoclase
-(Na,Ca)[Al(Si,Al)Si2O8]
'Chlorite Group'-
'Fahlunite'-(Mg,Fe)Al2Si3O10 · 2H2O
'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
H Fahlunite(Mg,Fe)Al2Si3O10 · 2H2O
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
BeBeryllium
Be BerylBe3Al2(Si6O18)
Be ChrysoberylBeAl2O4
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O AlbiteNa(AlSi3O8)
O BerylBe3Al2(Si6O18)
O ChrysoberylBeAl2O4
O Fahlunite(Mg,Fe)Al2Si3O10 · 2H2O
O Garnet GroupX3Z2(SiO4)3
O MicroclineK(AlSi3O8)
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O QuartzSiO2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
NaSodium
Na AlbiteNa(AlSi3O8)
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg Fahlunite(Mg,Fe)Al2Si3O10 · 2H2O
AlAluminium
Al AlbiteNa(AlSi3O8)
Al BerylBe3Al2(Si6O18)
Al ChrysoberylBeAl2O4
Al Fahlunite(Mg,Fe)Al2Si3O10 · 2H2O
Al MicroclineK(AlSi3O8)
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Si AlbiteNa(AlSi3O8)
Si BerylBe3Al2(Si6O18)
Si Fahlunite(Mg,Fe)Al2Si3O10 · 2H2O
Si Garnet GroupX3Z2(SiO4)3
Si MicroclineK(AlSi3O8)
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si QuartzSiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SSulfur
S MolybdeniteMoS2
KPotassium
K MicroclineK(AlSi3O8)
CaCalcium
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
FeIron
Fe Fahlunite(Mg,Fe)Al2Si3O10 · 2H2O
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
MoMolybdenum
Mo MolybdeniteMoS2

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Devonian - Silurian
358.9 - 443.8 Ma



ID: 3186140
Paleozoic sedimentary and volcanic rocks

Age: Paleozoic (358.9 - 443.8 Ma)

Lithology: Mudstone-carbonate-sandstone-conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Middle Ordovician
458.4 - 470 Ma



ID: 2982862
Upper member [of Middletown Formation]

Age: Middle Ordovician (458.4 - 470 Ma)

Stratigraphic Name: Middletown Formation

Description: Light-gray, generally rusty weathering, well-layered gneiss and granofels, composed of oligoclase, quartz, biotite, and amphibole (cummingtonite, anthophyllite, gedrite, or hornblende, or several of these), also garnet and chlorite. Many layers of amphibolite and biotite gneiss throughout.

Comments: Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Bronson Hill Anticlinorium Original map source: Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2000, Bedrock Geology of Connecticut, shapefile, scale 1:50,000

Lithology: Major:{gneiss,granofels}, Minor:{amphibolite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.
Davis, James W. (1901): The Minerals of Haddam, Connecticut Mineral Collector: 8(4): 50-54, and 8(5): 65-70.
Williams, Horace S. (circa 1945): Article for New York Society of Mineralogists. Brainerd Public Library, Haddam, Connecticut.


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