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Penfield Quarry (Oak Leaf Quarry), Portland, Middlesex Co., Connecticut, USA

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List of minerals arranged by Dana 8th Edition classification
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Ishikawaite8.1.4.1U4+Fe2+Nb2O8
AB2O6
Columbite-(Fe)8.3.2.2FeNb2O6
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
Annite71.2.2b.3KFe2+3(AlSi3O10)(OH)2
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
Microcline76.1.1.5KAlSi3O8


8 entries listed. 8 valid minerals.

References

Montague, S. A. (1937): Some Mineral Localities Near Portland, Conn. Rocks & Minerals Vol. 12, No. 5, pg. 145.

Hanson, S. L., Jarnot, B. M., Falster, A. U., Simmons, W. B., Nizamoff, J. W.: (2003) "Nb-Ta-Ti Oxide Minerals from Two Pegmatites of the Middletown Area, Connecticut," abstract in "Contributed Papers in Specimen Mineralogy, Part 2, 30th Rochester Mineralogical Symposium", Rocks & Minerals, Vol. 79, No. 4, p. 255.

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