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Unnamed quarry SE of Middletown (molybdenite locality), White Rock Mining District, Middletown, Middlesex Co., Connecticut, USAi
Regional Level Types
Unnamed quarry SE of Middletown (molybdenite locality)Quarry (Backfilled)
White Rock Mining DistrictMining District
Middletown- not defined -
Middlesex Co.County
ConnecticutState
USACountry

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Key
Latitude & Longitude (WGS84):
41° 32' 44'' North , 72° 35' 18'' West
Latitude & Longitude (decimal):
Locality type:
Quarry (Backfilled) - last checked 2019
Nearest Settlements:
PlacePopulationDistance
Portland5,862 (2017)5.3km
Middletown46,756 (2017)5.5km
Higganum1,698 (2017)6.0km
Cromwell13,750 (2017)7.3km
East Hampton2,691 (2017)7.9km


A huge, approximately 1 km long, NE-trending pegmatite was quarried by The Feldspar Corp. between the late 1980s and 1993, when all quarrying in the district ended. No name is known for this quarry. When collecting was allowed in the 1988-91 time-frame it was simply referred to, like all the quarries in the district, as the White Rocks quarry. However, this separate quarry was easily the largest pegmatite quarry in the state, if not New England, covering approximately 12 hectares (30 acres). Quarrying started in the center and was carried on separately at the NE and SW ends, all sections eventually joining into one huge quarry by 1990. The quarry has since been filled in, only a quarry face at the extreme SW end remains. The coordinates below are for the center of the quarry.

According to London (1985), this large pegmatite has very simple mineralogy and is similar to a coarse-grained granite, with little in the way of internal zoning, other than huge graphic granite microcline-quartz intergrowths, and no complex chemistry. Beryl, schorl, almandine, and fluorapatite are the major accessory minerals and they were not abundant. However, it is crossed by quartz veins that include pockets with pyrite crystals and at its NE end it produced the best molybdenite crystals in Connecticut. These were known as far back as 1825, as the word "molybdena" appears on the map by Porter (1825) in the White Rocks area.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


10 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Habit: anhedral
Colour: white to pale green
Reference: Stugard (1958); Harold Moritz collection
Almandine
Formula: Fe2+3Al2(SiO4)3
Habit: trapezohedral
Colour: purplish-red
Description: Small crystals up to 0.6 cm.
Reference: Harold Moritz collection
Beryl
Formula: Be3Al2(Si6O18)
Habit: hexagonal prisms
Colour: pale green
Description: subhedral crystals to about 5 cm long
Reference: Harold Moritz collection
Ferro-hornblende
Formula: ☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2
Habit: Slightly elongated prismatic
Colour: black
Description: Porphyroblasts in amphibole gneiss adjacent to the pegmatite, subhedral crystals to about 1 cm.
Reference: Harold Moritz collection
Fluorapatite
Formula: Ca5(PO4)3F
Habit: anhedral to subhedral hexagonal
Colour: pale gray-white
Fluorescence: yellow
Reference: Harold Moritz collection
Microcline
Formula: K(AlSi3O8)
Habit: anhedral
Colour: tan
Description: Huge anhedral graphic granite crystals
Reference: Stugard (1958); London (1985); Harold Moritz collection
Molybdenite
Formula: MoS2
Habit: hexagonal, tabular
Colour: metallic gray
Description: Excellent euhedral crystals to 5 cm
Reference: Harold Moritz collection
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Habit: anhedral
Colour: silvery
Reference: Harold Moritz collection
Pyrite
Formula: FeS2
Habit: cubo-octahedral
Colour: brassy
Description: Masses of sub-cm crystals lining small pockets in cross-cutting quartz veins.
Reference: Harold Moritz collection
Quartz
Formula: SiO2
Habit: anhedral, massive
Colour: white to smoky
Reference: London (1985); Harold Moritz collection

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Almandine9.AD.25Fe2+3Al2(SiO4)3
Beryl9.CJ.05Be3Al2(Si6O18)
Ferro-hornblende9.DE.10☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
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, Mixtures, etc.
Ferro-hornblende-☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2

List of minerals for each chemical element

HHydrogen
H MuscoviteKAl2(AlSi3O10)(OH)2
H Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
BeBeryllium
Be BerylBe3Al2(Si6O18)
OOxygen
O BerylBe3Al2(Si6O18)
O AlmandineFe32+Al2(SiO4)3
O FluorapatiteCa5(PO4)3F
O MicroclineK(AlSi3O8)
O AlbiteNa(AlSi3O8)
O QuartzSiO2
O MuscoviteKAl2(AlSi3O10)(OH)2
O Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
FFluorine
F FluorapatiteCa5(PO4)3F
NaSodium
Na AlbiteNa(AlSi3O8)
AlAluminium
Al BerylBe3Al2(Si6O18)
Al AlmandineFe32+Al2(SiO4)3
Al MicroclineK(AlSi3O8)
Al AlbiteNa(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
SiSilicon
Si BerylBe3Al2(Si6O18)
Si AlmandineFe32+Al2(SiO4)3
Si MicroclineK(AlSi3O8)
Si AlbiteNa(AlSi3O8)
Si QuartzSiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S MolybdeniteMoS2
S PyriteFeS2
KPotassium
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca FluorapatiteCa5(PO4)3F
Ca Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
FeIron
Fe PyriteFeS2
Fe AlmandineFe32+Al2(SiO4)3
Fe Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
MoMolybdenum
Mo MolybdeniteMoS2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Porter, T. D. (1825): T. D. Porter's Localities of Minerals on Connecticut River. American Journal of Science: series 1: (9): 177 and figure at end plate.
Stugard, Frederick. (1958): Pegmatites of the Middletown Area, Connecticut. U. S. Geological Survey Bulletin 1042-Q.
Eaton and Rosenfeld. (1972): The Bedrock Geology of the Middle Haddam Quadrangle, Connecticut. U. S. Geological Survey open file report.
London, David. (1985): Pegmatites of the Middletown District, Connecticut. State Geological and Natural History Survey of Connecticut, Department of Environmental Protection, Guidebook No. 6: 509-533.
Altamura, Robert J. (1987): Bedrock Mines and Quarries of Connecticut. Connecticut Geological and Natural History Survey Natural Resources Atlas Series Map, 1:125,000 scale, with 41-p. booklet.

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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