| Locality type: | Dam |
| Classification |
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| Species: | Sillimanite |
| Formula: | Al2(SiO4)O |
| Habit: | massive, striated |
| Colour: | gray to pale olive green |
| Abundance at site: | Common |
| Confirmation |
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| Validity: | Confirmed |
| Confirmation Methods: | Visually Identified |
| Associated Minerals Based on Photo Data: |
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| Biotite | 1 |
| Data |
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| Mineral Data: | Click here to view Sillimanite data |
| Locality Data: | Click here to view Hoopes Dam, New Castle County, Delaware, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 837943 |
| Long-form Identifier: | 1:3:837943:6 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Sillimanite |
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| 1.2km (0.8 miles) | ⓘDickson's Quarry (Dixon's Quarry), Wilmington, New Castle County, Delaware, USA |
| 10.8km (6.7 miles) | ⓘNevin's Quarry, Landenberg, London Britain Township, Chester County, Pennsylvania, USA |
| 11.8km (7.3 miles) | ⓘBullock's Quarry, Brandywine Summit, Chadds Ford Township, Delaware County, Pennsylvania, USA |
| 45.2km (28.1 miles) | ⓘRidge Avenue and School Lane Quarries, East Falls, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 45.7km (28.4 miles) | ⓘFalls of Schuylkill, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 47.5km (29.5 miles) | ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 53.5km (33.2 miles) | ⓘHorrock's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 65.6km (40.8 miles) | ⓘSafe Harbor Quarry, Safe Harbor, Conestoga Township, Lancaster County, Pennsylvania, USA |
| References |
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Hoopes Dam, New Castle County, Delaware, USA