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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 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO₄
Ishikawaite	8.1.4.1	U⁴⁺Fe²⁺Nb₂O₈
AB₂O₆
Columbite-(Fe)	8.3.2.2	FeNb₂O₆
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si₆O₁₈] rings; possible (OH) and Al substitution
Beryl	61.1.1.1	Be₃Al₂(Si₆O₁₈)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Annite	71.2.2b.3	KFe²⁺₃(AlSi₃O₁₀)(OH)₂
Muscovite	71.2.2a.1	KAl₂(AlSi₃O₁₀)(OH)₂
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO₂ with [4] coordinated Si
Quartz	75.1.3.1	SiO₂
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Microcline	76.1.1.5	KAlSi₃O₈

7 entries listed. 7 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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Copyright © Jolyon Ralph and Ida Chau 1993-2012. Jobs in Connecticut, USA Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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