| Locality type: | Road Cutting |
| Classification |
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| Species: | Opal var: Opal-AN |
| Formula: | SiO2 · nH2O |
| Comments: | Coating on quartz from pegmatite. |
| Habit: | encrustation |
| Colour: | brown-stained |
| Luminescent properties: | bright green under SW UV |
| Abundance at site: | Very Rare |
| Confirmation |
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| Validity: | Believed Valid |
| Associated Minerals Based on Photo Data: |
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| Quartz | β5 photos of Opal-AN associated with Quartz at this locality. |
| Dolomite | β2 photos of Opal-AN associated with Dolomite at this locality. |
| Albite | β1 photo of Opal-AN associated with Albite at this locality. |
| Microcline | β1 photo of Opal-AN associated with Microcline at this locality. |
| Data |
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| Mineral Data: | Click here to view Opal-AN data |
| Locality Data: | Click here to view U. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield County, Connecticut, USA |
| Photo Gallery | View Gallery (2 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 810543 |
| Long-form Identifier: | 1:3:810543:1 |
| GUID (UUID V4): | e837ea81-a614-4e60-924b-ad6251e1e240 |
| Nearest other occurrences of Opal-AN |
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| 4.0km (2.5 miles) | βSky Ridge railroad cut, Hawleyville, Newtown, Fairfield County, Connecticut, USA |
| 6.7km (4.2 miles) | βNorth Street mall, Danbury, Fairfield County, Connecticut, USA |
| 10.4km (6.4 miles) | βWestern Connecticut State College, Danbury, Fairfield County, Connecticut, USA |
| 11.4km (7.1 miles) | βBiermann Quarries (Bethel quarries) and tourmaline ledge, Bethel, Fairfield County, Connecticut, USA |
| 13.9km (8.6 miles) | βRoxbury Iron Mine (Shepaug Iron Company Mine; Shepaug Spathic Iron and Steel Company Mine), Mine Hill (Ore Hill), Roxbury, Litchfield County, Connecticut, USA |
| 15.3km (9.5 miles) | βSouthbury, New Haven County, Connecticut, USA |
| 18.3km (11.4 miles) | βCurtis Quarry (Southford Quarry; Southford pegmatite; Southbury rose quartz quarry; Bridgeport Woodfinishing Co. Quarry; Hulls Hill), Southford, Southbury, New Haven County, Connecticut, USA |
| 19.1km (11.9 miles) | βInterstate 84 road cuts, Town of Southeast, Putnam County, New York, USA |
| 20.2km (12.5 miles) | βCasey Quarry (Ridgefield pegmatite), Ridgefield, Fairfield County, Connecticut, USA |
| 20.7km (12.9 miles) | βFillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield County, Connecticut, USA |
| References |
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U. S. Route 7 Expressway, Brookfield, Fairfield County, Connecticut, USA