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State Route 9 and State Route 81 Interchange, Higganum, Haddam, Middlesex Co., Connecticut, USAi
Regional Level Types
State Route 9 and State Route 81 Interchange- not defined -
Higganum- not defined -
Haddam- not defined -
Middlesex Co.County
ConnecticutState
USACountry

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Key
Latitude & Longitude (WGS84):
41° 28' 15'' North , 72° 33' 23'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Higganum1,698 (2017)2.9km
East Haddam9,042 (2017)8.2km
Moodus1,413 (2017)9.5km
Durham2,933 (2017)10.5km
Chester Center1,558 (2017)11.6km


A series of road cuts in Ordovician Monson Orthogneiss and Middletown metavolcanics Formation cross-cut by the Jurassic Higganum diabase dike.
Of particular note is a small nepheline syenite body discovered by Richard Schooner in 1967 with mineralogy similar to the plutons at Mont Saint-Hilaire, Quebec and at Haliburton County, Ontario. It is located in the Route 9 cut just southeast of Route 81.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


14 valid minerals.

Detailed Mineral List:

Aegirine
Formula: NaFe3+Si2O6
Colour: greenish
Description: Accompanies black hastingsite
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Calcite
Formula: CaCO3
Habit: massive
Colour: white
Description: Accompanies zeolites.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
'Chabazite'
Habit: rhombohedral
Colour: orange
Description: Attractive specimens. Along joint planes, drusy colorless rhombs occurred; part of the rock, containing scapolite and altered nepheline, was composed of massive orange chabazite, with a few vugs of crystals. Natrolite and stilbite were intergrown.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Chalcopyrite
Formula: CuFeS2
Habit: anhedral
Description: Scattered tiny grains.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Dickite
Formula: Al2(Si2O5)(OH)4
Habit: massive
Colour: bluish-gray
Description: nepheline-sodalite rock has been extensively replaced by fine-grained bluish-gray dickite and white natrolite.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Description: With scapolite.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Fluorapatite
Formula: Ca5(PO4)3F
Habit: hexagonal prism
Colour: green
Description: A single green prismatic crystal was collected.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Hastingsite
Formula: {Na}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(OH)2
Habit: subhedral prismatic
Colour: black
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Magnetite
Formula: Fe2+Fe3+2O4
Habit: octaheral
Colour: black
Description: Tiny anhedral to euhedral grains.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Habit: acicular, massive
Colour: white to pale gray
Description: Compact natrolite was abundant, as radial white aggregates of micro-crystals, sometimes with orange chabazite and stilbite. It closely resembled pectolite, for which it was long mistaken.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Nepheline
Formula: Na3K(Al4Si4O16)
Habit: anhedral to subhedral grains
Colour: pale gray
Description: Major component of the rock.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Nontronite
Formula: Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Habit: clay
Colour: greenish
Description: A greenish clay mineral, forming a vein or zone, near the contact of a nepheline-bearing dike and granite gneiss has been identified as nontronite. It was studied by X-ray diffraction.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Pyrite
Formula: FeS2
Habit: subhedral
Description: Tiny grains.
Reference: Former Richard Schooner collection.
Quartz
Formula: SiO2
Habit: massive
Description: With stilbite in fractures.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
'Scapolite'
Habit: granular
Description: coarse-grained scapolite accompanied epidote, calcite, and altered nepheline
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
Sodalite
Formula: Na8(Al6Si6O24)Cl2
Colour: white
Description: Much altered to zeolites.
Reference: Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
'Stilbite subgroup'
Habit: fan-shaped aggregates
Colour: orange
Description: "Some fine large specimens show fans of orange stilbite in quartz. A long narrow vein was composed essentially of nondescript massive dull orange stilbite, with two different clay minerals. A mixture of stilbite and chabazite, both orange or orange-red, filled interstices of compact white natrolite." Schooner (circa 1990). Also found in small veins in the Higganum Diabase.
Reference: Schooner, Richard. (circa 1990), Untitled manuscript on central Connecticut mineralogy.; Harold Moritz field observations 2015.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
Aegirine9.DA.25NaFe3+Si2O6
Dickite9.ED.05Al2(Si2O5)(OH)4
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Hastingsite9.DE.15{Na}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(OH)2
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Nepheline9.FA.05Na3K(Al4Si4O16)
Nontronite9.EC.40Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Sodalite9.FB.10Na8(Al6Si6O24)Cl2
Unclassified Minerals, Rocks, etc.
'Chabazite'-
'Scapolite'-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
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)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Aegirine65.1.3c.2NaFe3+Si2O6
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Dickite71.1.1.1Al2(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 clays
Nontronite71.3.1a.3Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
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 Feldspathoids and related species
Nepheline76.2.1.2Na3K(Al4Si4O16)
Sodalite76.2.3.1Na8(Al6Si6O24)Cl2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Mixtures, etc.
'Chabazite'-
Hastingsite-{Na}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(OH)2
'Scapolite'-
'Stilbite subgroup'-

List of minerals for each chemical element

HHydrogen
H Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
H DickiteAl2(Si2O5)(OH)4
H NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H NatroliteNa2Al2Si3O10 · 2H2O
CCarbon
C CalciteCaCO3
OOxygen
O AegirineNaFe3+Si2O6
O Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
O FluorapatiteCa5(PO4)3F
O DickiteAl2(Si2O5)(OH)4
O MagnetiteFe2+Fe23+O4
O SodaliteNa8(Al6Si6O24)Cl2
O NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
O QuartzSiO2
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O NephelineNa3K(Al4Si4O16)
O CalciteCaCO3
O NatroliteNa2Al2Si3O10 · 2H2O
FFluorine
F FluorapatiteCa5(PO4)3F
NaSodium
Na AegirineNaFe3+Si2O6
Na Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
Na SodaliteNa8(Al6Si6O24)Cl2
Na NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Na NephelineNa3K(Al4Si4O16)
Na NatroliteNa2Al2Si3O10 · 2H2O
AlAluminium
Al Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
Al DickiteAl2(Si2O5)(OH)4
Al SodaliteNa8(Al6Si6O24)Cl2
Al NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al NephelineNa3K(Al4Si4O16)
Al NatroliteNa2Al2Si3O10 · 2H2O
SiSilicon
Si AegirineNaFe3+Si2O6
Si Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
Si DickiteAl2(Si2O5)(OH)4
Si SodaliteNa8(Al6Si6O24)Cl2
Si NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Si QuartzSiO2
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si NephelineNa3K(Al4Si4O16)
Si NatroliteNa2Al2Si3O10 · 2H2O
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S ChalcopyriteCuFeS2
S PyriteFeS2
ClChlorine
Cl SodaliteNa8(Al6Si6O24)Cl2
KPotassium
K NephelineNa3K(Al4Si4O16)
CaCalcium
Ca Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
Ca FluorapatiteCa5(PO4)3F
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca CalciteCaCO3
FeIron
Fe AegirineNaFe3+Si2O6
Fe Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
Fe ChalcopyriteCuFeS2
Fe MagnetiteFe2+Fe23+O4
Fe NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe PyriteFeS2
CuCopper
Cu ChalcopyriteCuFeS2

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Schooner, Richard. (circa 1990), Untitled manuscript on central Connecticut mineralogy.

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