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⇱ Opal from Hale-Walker prospects, Collins Hill, Portland, Middlesex County, Connecticut, USA

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Opal from
Hale-Walker prospects, Collins Hill, Portland, Middlesex County, Connecticut, USA

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Locality type:Prospect
Classification
Species:Opal
Formula:SiO2 · nH2O
Comments:Reference contains only a list with no details, but it is common in all pegmatites in the district.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Hale-Walker prospects, Collins Hill, Portland, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:96303
Long-form Identifier:1:3:96303:7
GUID (UUID V4):0
Nearest other occurrences of Opal
0.8km (0.5 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
2.0km (1.2 miles) ⓘPelton's Quarry, Portland, Middlesex County, Connecticut, USA
3.3km (2.0 miles) ⓘGreat Hill cobalt mines, Cobalt, East Hampton, Middlesex County, Connecticut, USA
3.3km (2.1 miles) ⓘRiverside Quarry (Western Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA
3.6km (2.3 miles) ⓘWhite Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA
3.8km (2.3 miles) ⓘWalden Gem Quarry, Portland, Middlesex County, Connecticut, USA
3.8km (2.4 miles) ⓘGotta-Walden Prospect, Portland, Middlesex County, Connecticut, USA
4.1km (2.6 miles) ⓘNathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
4.5km (2.8 miles) ⓘCase Quarries, Portland, Middlesex County, Connecticut, USA
4.9km (3.1 miles) ⓘHale Quarry (Andrews Quarry; Glastonbury Quarry), Portland, Middlesex County, Connecticut, USA
References
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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