| Locality type: | Mine |
| Classification |
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| Species: | Magnetite |
| Formula: | Fe2+Fe23+O4 |
| Comments: | Magnetite was the main constituant or primary ore processed at Cornwall. The mines were in continuous operation, to varying degrees, from 1740, up to the time of it's closing and ranked as the longest continuing mining operation in the US. The mines were finally closed by flood waters created when Hurricane Agnes came through the area in 1972. |
| Habit: | octahedral, frequently with crystal edging modifications |
| Colour: | Silvery grey, metalic luster |
| Quality for species: | Good crystals or rich for species - important (!) |
| Abundance at site: | Extremely common |
| Confirmation |
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| Validity: | Confirmed |
| Confirmation Methods: | Visually Identified |
| Associated Minerals Based on Photo Data: |
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| Pyrite | ⓘ12 photos of Magnetite associated with Pyrite at this locality. |
| Azurite | ⓘ3 photos of Magnetite associated with Azurite at this locality. |
| Actinolite | ⓘ3 photos of Magnetite associated with Actinolite at this locality. |
| Chlorite Group | ⓘ2 photos of Magnetite associated with Chlorite Group at this locality. |
| Serpentine Subgroup | ⓘ2 photos of Magnetite associated with Serpentine Subgroup at this locality. |
| Chalcopyrite | ⓘ1 photo of Magnetite associated with Chalcopyrite at this locality. |
| Data |
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| Mineral Data: | Click here to view Magnetite data |
| Locality Data: | Click here to view Cornwall Mines (Cornwall Iron Mine), Cornwall Borough (Cornwall), Lebanon County, Pennsylvania, USA |
| Photo Gallery | View Gallery (11 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 38881 |
| Long-form Identifier: | 1:3:38881:0 |
| GUID (UUID V4): | 79714e59-a6a8-4644-8a1d-4bf1d803e5cf |
| Nearest other occurrences of Magnetite |
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| 10.4km (6.4 miles) | ⓘCarper mine, Lebanon County, Pennsylvania, USA |
| 23.6km (14.7 miles) | ⓘMud Lake - Grubb Lake, West Hempfield Township, Lancaster County, Pennsylvania, USA |
| 40.3km (25.1 miles) | ⓘReeser's Summit, Frogtown, York County, Pennsylvania, USA |
| 40.6km (25.3 miles) | ⓘFritz Island Mines, Cumru Township, Berks County, Pennsylvania, USA |
| 45.4km (28.2 miles) | ⓘGrace Mine, Morgantown, Berks County, Pennsylvania, USA |
| 47.6km (29.6 miles) | ⓘBlandon, Maidencreek Township, Berks County, Pennsylvania, USA |
| 47.9km (29.8 miles) | ⓘJones Mine, Morgantown, Caernarvon Township, Berks County, Pennsylvania, USA |
| 48.1km (29.9 miles) | ⓘJones mine, Hopewell Mines, Warwick (Saint Marys), Warwick Township, Chester County, Pennsylvania, USA |
| 49.5km (30.7 miles) | ⓘOld York Road/State Route 4026 Roadcut, Rossville, Warrington Township, York County, Pennsylvania, USA |
| 52.1km (32.4 miles) | ⓘHopewell Mines, Warwick (Saint Marys), Warwick Township, Chester County, Pennsylvania, USA |
| References |
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Cornwall Mines, Cornwall Borough, Lebanon County, Pennsylvania, USA