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Magnetite from
Cornwall Mines (Cornwall Iron Mine), Cornwall Borough (Cornwall), Lebanon Co., Pennsylvania, USA

Locality type:Mine
Classification
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
Validity:Confirmed
Confirmation Methods:Visually Identified
References
References:Rocks & Min.: 13:213.; Econ Geol (1985) 80:418-443
Associated Minerals Based on Photo Data:
Pyrite2 photos of Magnetite associated with Pyrite at this locality.
Chalcopyrite1 photo of Magnetite associated with Chalcopyrite at this locality.
Data
Mineral Data:Click here to view Magnetite data
Locality Data:Click here to view Cornwall Mines (Cornwall Iron Mine), Cornwall Borough (Cornwall), Lebanon Co., Pennsylvania, USA
Photo GalleryView Gallery (4 photos)
Nearest other occurrences of Magnetite
40.3km (25.1 miles) Reeser's Summit, Frogtown, York Co., Pennsylvania, USA
40.6km (25.3 miles) Fritz Island Mines, Cumru Township, Berks Co., Pennsylvania, USA
47.6km (29.6 miles) Blandon, Maidencreek Township, Berks Co., Pennsylvania, USA
47.9km (29.8 miles) Jones Mine, Morgantown, Caernarvon Township, Berks Co., Pennsylvania, USA
49.5km (30.7 miles) Old York Road/State Route 4026 roadcut, Rossville, Warrington Township, York Co., Pennsylvania, USA
53.8km (33.4 miles) King Mine, Dillsburg Iron Mines, Dillsburg, York Co., Pennsylvania, USA
54.2km (33.7 miles) Price Mine, Dillsburg Iron Mines, Dillsburg, York Co., Pennsylvania, USA
54.3km (33.7 miles) Jauss Mine, Dillsburg Iron Mines, Dillsburg, York Co., Pennsylvania, USA
54.8km (34.0 miles) Altland Mine, Dillsburg Iron Mines, Dillsburg, York Co., Pennsylvania, USA
54.8km (34.0 miles) Dillsburg Iron Mines, Dillsburg, York Co., Pennsylvania, USA
 
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