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Nathan Hall Quarry (Clark Hill Quarry), East Hampton (Chatham), Middlesex Co., Connecticut, USA

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Detailed Mineral List:


Albite
Formula: Na(AlSi3O8)
Colour: white
Description: Euhedral crystals restricted to the lining of small pockets.
Reference: P Cristofono collection, 2007 Harold Moritz collection, 1991-2009
Almandine
Formula: Fe2+3Al2(SiO4)3
Habit: complex mix of forms, generally modified trapezohedrons
Colour: maroon
Description: 7 specimens were tested for Fe and Mn content using X-ray fluorescence. The Mn percentage of the total Fe+Mn content varied from 23 to 47%, indicating there were all almandine. Crystals are typically coated with dark, probable Mn oxides coating, but this does not prove they are spessartine.
Reference: Field collected by Harold Moritz, confirmed by XRF.
Annite
Formula: KFe2+3(AlSi3O10)(OH)2
Habit: elongated tabular subhedral
Colour: black
Description: Crystals apparently reached several dm long as they are typically found as fragments in the dump, sometimes interlayered with muscovite.
Reference: Field collected by Harold Moritz.
Autunite
Formula: Ca(UO2)2(PO4)2 · 11H2O
Reference: P Cristofono collection, 2007
Beryl
Formula: Be3Al2(Si6O18)
Habit: elongated prisms with pinacoidal or somewhat rounded pyramidal terminations
Colour: yellow, pale green, aqua
Description: Crystals found frozen in fragments of the intermediate zone (quartz, albite, some muscovite) of the pegmatite.
Reference: LMSCC Newsletter, Sept. 2005 Harold Moritz collection, 1991-2009
Bismutite
Formula: (BiO)2CO3
Reference: David Busha collection
Columbite-(Fe)
Formula: FeNb2O6
Habit: skeletal, tabular, stout or elongated prisms
Colour: black with iridescence
Description: Wide variety of crystal habits, stout prisms reach a about 3 x 5 cm, while skeletal crystals intergrown with albite can reach 8 cm. Several crystals tested using XRD and Raman spectroscopy.
Reference: Field collected by Harold Moritz.
Fluorapatite
Formula: Ca5(PO4)3F
Habit: anhedral to subhedral grains
Colour: pale gray-green
Fluorescence: yellow
Description: subhedral grains can reach several cm
Reference: Harold Moritz collection
Foitite ?
Formula: (□,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OH
Habit: massive material, skeletal/interstitial in graphic granite
Colour: black
Description: Tested by Raman spectroscopy at the University of New Haven, spectrum was weak but consistent with foitite. Thin masses interstitial within microcline/quartz graphic granite, unusual as that association is typically barren of interesting minerals.
Reference: Fred E Davis Collection
Goethite
Formula: α-Fe3+O(OH)
Reference: Kevin Czaja Collection
Löllingite
Formula: FeAs2
Reference: David Busha collection; David Busha collection SEM-EDS by Kaygeedee Minerals
Meta-autunite
Formula: Ca(UO2)2(PO4)2 · 6-8H2O
Habit: encrustations
Colour: yellow
Fluorescence: green
Description: excellent halos surrounding other uranium secondary minerals and altered uraninite.
Reference: Field collected by Harold Moritz.
Metatorbernite
Formula: Cu(UO2)2(PO4)2 · 8H2O
Habit: square tabular
Colour: green
Description: usually anhedral crusts and associated with other secondary U minerals
Reference: Field collected by Harold Moritz.
Microcline
Formula: K(AlSi3O8)
Habit: prismatic
Colour: tan
Description: rare in good crystals, some fragments found
Reference: Field collected by Harold Moritz.
Monazite-(Ce)
Formula: Ce(PO4)
Habit: tabular subhedral
Colour: brown
Description: One small glassy subhedral crystal found and confirmed by X-ray diffraction test.
Reference: Field collected by Harold Moritz, confirmed by XRD.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Habit: tabular, pseudo-hexagonal
Colour: silver
Description: Anhedral in the intermediate zone, but euhedral along the contact of this zone with the quartz core. Also as fine-grained pseudomorphs after euhedral schorl.
Reference: LMSCC Newsletter, Sept. 2005 Harold Moritz collection, 1991-2009
Opal
Formula: SiO2 · nH2O
Habit: encrustations
Colour: colorless
Fluorescence: green
Description: inconspicuous unless illuminated by SW UV.
Reference: Field collected by Harold Moritz.
Opal var: Opal-AN
Formula: SiO2 · nH2O
Habit: encrustations
Colour: colorless
Fluorescence: green
Description: inconspicuous unless illuminated by SW UV.
Reference: Field collected by Harold Moritz.
Quartz
Formula: SiO2
Colour: clear, white
Reference: LMSCC Newsletter, Sept. 2005 Harold Moritz collection, 1991-2009
Quartz var: Ferruginous Quartz
Formula: SiO2
Reference: P Cristofono collection, 2007
Quartz var: Rose Quartz
Formula: SiO2
Colour: pink
Description: Although reported by Foye (1922), no modern specimens found. Perhaps he was referring to the abundant ferruginous quartz.
Reference: LMSCC Newsletter, Sept. 2005 Foye, W. G. (1922): MINERAL LOCALITIES IN THE VICINITY OF MIDDLETOWN, CONNECTICUT. American Mineralogist, Volume 7, pages 4-12.
Quartz var: Smoky Quartz
Formula: SiO2
Colour: grey to black
Reference: Field collected by Harold Moritz.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Habit: elongated prisms with shallow rhombohedral terminations
Colour: black
Description: generally anhedral to subhedral, crystals crumble readily. Euhedral crystals pseudomorphed by fine-grained muscovite are common.
Reference: LMSCC Newsletter, Sept. 2005 Harold Moritz collection 1991-2009
Spessartine
Formula: Mn2+3Al2(SiO4)3
Colour: maroon
Description: As a component in almandine, not verified as a separate species. XRF testing of 7 garnets found 23 to 47% Mn component of the total Fe-Mn content.
Reference: Field collected by Harold Moritz, confirmed by XRF.
Staurolite
Formula: Fe2+2Al9Si4O23(OH)
Reference: Daniel J. Kimball
Tapiolite-(Fe)
Formula: (Fe,Mn)(Ta,Nb)2O6
Habit: Complex, twinned short prisms or pyramidal tetragonal.
Colour: black
Description: Three specimens are known, with very similar with crystals about 3-4 cm, in quartz, albite and/or muscovite. Two are complexly crystallized apparently twinned, that somewhat resemble garnets, but of course black and submetallic. Other than one specimen from the Hale Quarry, this is the only known Connecticut location for this mineral.
Reference: Leif DiValentino collection, Harold Moritz collection
Torbernite
Formula: Cu(UO2)2(PO4)2 · 12H2O
Uraninite
Formula: UO2
Habit: octahedral
Colour: black
Description: Typically highly altered and surrounded by secondary U mineral haloes.
Reference: P Cristofono collection, 2007 Harold Moritz collection, 1991-2009
Uranophane
Formula: Ca(UO2)2(SiO3OH)2 · 5H2O
Colour: yellow
Description: Usually replacing small uraninite crystals.
Reference: P Cristofono collection, 2007 Harold Moritz collection 1991-2009
'Yttrocolumbite-(Y)' ?
Formula: Y(U4+,Fe2+)Nb2O8
Description: Extremely rare mineral. No chemical data available.
Zircon
Formula: Zr(SiO4)
Habit: radiating aggregates
Colour: brown
Description: Usually small, inconspicuous brown radiating aggregates, often stained with limonite.
Reference: Field collected by Harold Moritz.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Foye, Wilbur 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.
Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
LMSCC Newsletter (2005), (September).

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