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Corporate Drive construction site, Long Hill, Trumbull, Fairfield Co., Connecticut, USAi
Regional Level Types
Corporate Drive construction siteConstruction Site
Long HillHill
Trumbull- not defined -
Fairfield Co.County
ConnecticutState
USACountry

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Key
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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 41° North , 73° West (est.)
Margin of Error:~2km
Locality type:Construction Site
Köppen climate type:Cfa : Humid subtropical climate


A large construction site on Corporate Drive. Blasting took place in 2011-2012 exposing a contact between rusty The Straits Schist above its so-called basal member (marble and amphibolite with accessory scheelite). Rocks are moderately faulted and hydrothermal mineralization occurred along fault surfaces.

Fluids mineralizing faults were highly enriched in fluorine and likely low temperature, producing two separate kinds of mineralization.

The most significant for mineral collecting is the emplacement of several cross-cutting, subvertical veins (to approx. 0.75 m in width) of fluorite (variety chlorophane) and quartz, and with distinct marginal zones consisting of sharp, euhedral albite crystals, muscovite (not margarite, based on Raman spectroscopy), marialite (based on Raman spectroscopy), and phlogopite where the contacting amphibolite has been metasomatized. These crystals reach up to 4cm and are white with distinctive steep terminations as well as occasional pyrite lamellae. Raman spectroscopy shows these crystals are albite variety oligoclase, the typical composition for metamorphic albite in Connecticut. These crystals are easily chiseled out of a mixture of quartz and fluorite and make for aesthetic specimens albeit their lack of color! Surprisingly, topaz is generally lacking, unlike other similar veins in the area, including those exposed uphill and to the south across the street, see http://www.mindat.org/loc-217040.html, where it is abundant. The texture of the vein material grades from coarse to fine and porcellaneous in some areas and often the topaz has been highly altered to a mixture of muscovite and margarite(?). The chlorophane, present in large cleavable masses, is colorless to smoky and unless protected from daylight immediately upon its exposure loses its SW UV fluorescence.

As found in the surrounding area, the amphibolite (which hosts mostly sub-cm, scattered grains of scheelite) has been altered, with abundant clinozoisite, marialite, clinoclore, and quartz. It also contains zones and anhedral crystals of green albite variety oligoclase. Hydrothermal activity deposited pyrite and pyrrhotite in this unit, the marble, and the fluorite-quartz veins. Lamellae of pyrite and red-orange fluorescing calcite are present in thin fractures in all of these units. Although the scheelite is predominantly restricted to the amphibolite, tiny grains were detected by fluorescence along and proximal to small faults in the marble as well, apparently mobilized by the associated hydrothermal activity.

NOTE: Please respect the primary areas of collecting interest at this locality. I am avidly researching the genesis of fluorite veins here. I require assistance in performing spatially resolved XRF analysis of plagioclase feldspars as well as delta O analysis of the veins and country rock. If anyone can help with this project, please message me (Jeremy A. Zolan.)

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


16 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Habit: blocky euhedral
Colour: white, green
Description: Nice white crystals along contact of quartz-fluorite veins with surrounding amphibolite. Crystals to 4-5 cm. Massive green material in the amphibolite.
Reference: Harold Moritz collection
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Habit: blocky euhedral
Colour: white, green
Description: Nice white crystals along contact of quartz-fluorite veins with surrounding amphibolite. Crystals to 4-5 cm. Massive green material in the amphibolite.
Reference: Harold Moritz collection
'Biotite'
Reference: Visual ID- Jeremy A. Zolan
Calcite
Formula: CaCO3
Habit: massive
Colour: white
Fluorescence: red-orange
Description: Mostly as massive hydrothermal material.
Reference: Jeremy Zolan
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Habit: acicular
Colour: gray-brown
Description: In the amphibolite.
Reference: Jeremy Zolan
Clinozoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Reference: Jeremy Zolan
Fluorapatite
Formula: Ca5(PO4)3F
Habit: anhedral
Colour: colorless
Fluorescence: yellow
Description: Small grains in the quartz-fluorite veins, visible only by its fluorescence.
Reference: Harold Moritz collection
Fluorite
Formula: CaF2
Habit: massive
Colour: colorless to light smoky, rarely pale red
Fluorescence: blue-green with green phosphorescence
Description: As cleavable masses in the quartz-fluorite veins. Unless collected right after exposure to daylight, the fluorescence is lost.
Reference: Harold Moritz collection
Fluorite var: Chlorophane
Formula: CaF2
Habit: massive
Colour: colorless to light smoky, rarely pale red
Fluorescence: blue-green with green phosphorescence
Description: As cleavable masses in the quartz-fluorite veins. Unless collected right after exposure to daylight, the fluorescence is lost.
Reference: Harold Moritz collection
Margarite ?
Formula: CaAl2(Al2Si2O10)(OH)2
Description: Raman spectroscopy of mica from the quartz-fluorite-mica-topaz veins of the area shows it to be muscovite. Physical properties also agree with this species.
Reference: Jeremy Zolan
Marialite
Formula: Na4Al3Si9O24Cl
Habit: massive, radiating prismatic
Colour: white to gray, pale green
Fluorescence: pale orange
Description: In the amphibolite and along contacts with the quartz-fluorite veins.
Reference: Harold Moritz collection
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Jeremy Zolan
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Habit: anhedral
Colour: dark brown
Description: Mostly along contacts of the amphibolite with quartz-fluorite veins.
Reference: Harold Moritz collection
Pyrite
Formula: FeS2
Habit: massive
Description: As masses, veins, and thin lamellae in all units, but mostly in the amphibolite.
Reference: Jeremy Zolan
Pyrrhotite
Formula: Fe7S8
Habit: massive
Description: As masses, veins, and thin lamellae in all units, but mostly in the amphibolite.
Reference: Jeremy Zolan
Quartz
Formula: SiO2
Habit: masive
Description: Mostly as masses in the amphibolite.
Reference: Jeremy Zolan
Scheelite
Formula: Ca(WO4)
Habit: anhedral to subhedral
Colour: pale gray to white
Fluorescence: blue-white
Description: Mostly sub-cm grains scattered in the amphibolite, detectable mainly by SW UV fluorescence. Tiny grains near faults in the marble.
Reference: Harold Moritz collection
Siderite
Formula: FeCO3
Reference: Jeremy Zolan
Topaz
Formula: Al2(SiO4)(F,OH)2
Reference: Jeremy Zolan

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 3 - Halides
Fluorite3.AB.25CaF2
var: Chlorophane3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Siderite5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Scheelite7.GA.05Ca(WO4)
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
Clinozoisite9.BG.05a{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Margarite ?9.EC.30CaAl2(Al2Si2O10)(OH)2
Marialite9.FB.15Na4Al3Si9O24Cl
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Topaz9.AF.35Al2(SiO4)(F,OH)2
Unclassified Minerals, Rocks, etc.
'Biotite'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Siderite14.1.1.3FeCO3
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Scheelite48.1.2.1Ca(WO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Topaz52.3.1.1Al2(SiO4)(F,OH)2
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)
Clinozoisite58.2.1a.4{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Margarite ?71.2.2c.1CaAl2(Al2Si2O10)(OH)2
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
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)
Al-Si Framework with other Be/Al/Si frameworks
Marialite76.3.1.1Na4Al3Si9O24Cl
Unclassified Minerals, Mixtures, etc.
Albite
var: Oligoclase
-(Na,Ca)[Al(Si,Al)Si2O8]
'Biotite'-
Fluorite
var: Chlorophane
-CaF2

List of minerals for each chemical element

HHydrogen
H MuscoviteKAl2(AlSi3O10)(OH)2
H ClinochloreMg5Al(AlSi3O10)(OH)8
H Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
H TopazAl2(SiO4)(F,OH)2
H PhlogopiteKMg3(AlSi3O10)(OH)2
H MargariteCaAl2(Al2Si2O10)(OH)2
CCarbon
C SideriteFeCO3
C CalciteCaCO3
OOxygen
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O AlbiteNa(AlSi3O8)
O MuscoviteKAl2(AlSi3O10)(OH)2
O ClinochloreMg5Al(AlSi3O10)(OH)8
O Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
O TopazAl2(SiO4)(F,OH)2
O SideriteFeCO3
O MarialiteNa4Al3Si9O24Cl
O QuartzSiO2
O CalciteCaCO3
O ScheeliteCa(WO4)
O FluorapatiteCa5(PO4)3F
O PhlogopiteKMg3(AlSi3O10)(OH)2
O MargariteCaAl2(Al2Si2O10)(OH)2
FFluorine
F Fluorite (var: Chlorophane)CaF2
F FluoriteCaF2
F TopazAl2(SiO4)(F,OH)2
F FluorapatiteCa5(PO4)3F
NaSodium
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Na AlbiteNa(AlSi3O8)
Na MarialiteNa4Al3Si9O24Cl
MgMagnesium
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
AlAluminium
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al AlbiteNa(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Al TopazAl2(SiO4)(F,OH)2
Al MarialiteNa4Al3Si9O24Cl
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al MargariteCaAl2(Al2Si2O10)(OH)2
SiSilicon
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si AlbiteNa(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Si TopazAl2(SiO4)(F,OH)2
Si MarialiteNa4Al3Si9O24Cl
Si QuartzSiO2
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si MargariteCaAl2(Al2Si2O10)(OH)2
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S PyrrhotiteFe7S8
S PyriteFeS2
ClChlorine
Cl MarialiteNa4Al3Si9O24Cl
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Ca Fluorite (var: Chlorophane)CaF2
Ca FluoriteCaF2
Ca Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Ca CalciteCaCO3
Ca ScheeliteCa(WO4)
Ca FluorapatiteCa5(PO4)3F
Ca MargariteCaAl2(Al2Si2O10)(OH)2
FeIron
Fe SideriteFeCO3
Fe PyrrhotiteFe7S8
Fe PyriteFeS2
WTungsten
W ScheeliteCa(WO4)

References

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Field observations made by Jeremy A. Zolan


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