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

Classification
Species:Magnetite
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
Nearest other occurrences of Magnetite
40.3km (25.1 miles) A Reeser's Summit, Frogtown, York Co., Pennsylvania, USA
40.6km (25.3 miles) B Fritz Island Mines, Cumru Township, Berks Co., Pennsylvania, USA
47.6km (29.6 miles) C Blandon, Maidencreek Township, Berks Co., Pennsylvania, USA
47.9km (29.8 miles) D Jones Mine, Morgantown, Caernarvon Township, Berks Co., Pennsylvania, USA
58.7km (36.5 miles) E Keim's Mine, French Creek Mines, St. Peters, Warwick Township, Chester Co., Pennsylvania, USA
58.7km (36.5 miles) F French Creek Mines, St. Peters, Warwick Township, Chester Co., Pennsylvania, USA
61.0km (37.9 miles) G Cardiff Serpentine Quarry, Cardiff, Harford Co., Maryland, USA
63.7km (39.6 miles) H Red Pit Mine, Fulton Township, State Line Chromite District, Lancaster Co., Pennsylvania, USA
63.8km (39.6 miles) I West Placer Area (Preston Placer; Sweigarts Run; Swaggarts Run; West Placer; Thornbottom Run), Cecil Co., Maryland, USA
64.0km (39.8 miles) J Cedar Hill Quarry (Stoltzfuss Quarry), Fulton Township, State Line Chromite District, Lancaster Co., Pennsylvania, USA
64.2km (39.9 miles) K Haines & Kibblehouse Penn-Maryland Materials Quarry, Fulton Township, State Line Chromite District, Lancaster Co., Pennsylvania, USA
64.5km (40.1 miles) L Wood's Chrome Mine (Wood's Mine), Texas, Little Britain Township, State Line Chromite District, Lancaster Co., Pennsylvania, USA
64.6km (40.2 miles) M Broad Creek Mine, Whiteford, Harford Co., Maryland, USA
69.0km (42.9 miles) N Rittenhouse Gap Mine (Rittenhouse Gap Iron Mines), Rittenhouse Gap, Berks Co., Pennsylvania, USA
69.2km (43.0 miles) O Cherry Hill Ore Banks, Harford Co., Maryland, USA
69.2km (43.0 miles) P Deer Creek Mine, Harford Co., Maryland, USA
69.9km (43.5 miles) Q Olafsen Iron Mine, Huffs Church, Hereford Township, Berks Co., Pennsylvania, USA
71.0km (44.1 miles) R Corundum Hill, Unionville, Newlin Township, Chester Co., Pennsylvania, USA
71.0km (44.1 miles) S Shawsville Area, Harford Co., Maryland, USA
71.1km (44.2 miles) T Seisholtzville Mine, Seisholtzville, Berks Co., Pennsylvania, USA
72.2km (44.9 miles) U Norris Ore Bank, Baltimore Co., Maryland, USA
74.8km (46.5 miles) V McComas Ore Banks, Baltimore Co., Maryland, USA
79.1km (49.2 miles) W Kibblehouse Quarry, Perkiomenville, Marlborough Township, Montgomery Co., Pennsylvania, USA
81.2km (50.4 miles) X Brinton's Quarry, West Chester, Westtown Township, Chester Co., Pennsylvania, USA
84.3km (52.4 miles) Y Mount Cuba serpentinite, New Castle Co., Delaware, USA
85.5km (53.2 miles) Z Beaver Valley (Chandler's Hollow), New Castle Co., Delaware, USA
88.9km (55.3 miles) 0 Iron Hill, Newark, New Castle Co., Delaware, USA
92.2km (57.3 miles) 1 Williamson Trade School, Middletown Township, Delaware Co., Pennsylvania, USA
92.4km (57.4 miles) 2 Teeter Quarry (Teeters Quarry; Valley Quarry; John S. Teeter and Sons Co. Quarry; Gettysburg Quarry; H.T. Campbell's Teeter's Quarry), Gettysburg, Adams Co., Pennsylvania, USA
93.1km (57.9 miles) 3 Medford Quarry (Redland Genstar Quarry), Medford, Carroll Co., Maryland, USA
94.9km (59.0 miles) 4 Glyndon Occurrence, Baltimore Co., Maryland, USA
95.5km (59.4 miles) 5 Patapsco mine (Finksburg Mine; Orchard Mine), Patapsco Mines, Finksburg, Sykesville, Carroll Co., Maryland, USA
95.6km (59.4 miles) 6 Wildesen Mine, Patapsco Mines, Finksburg, Sykesville, Carroll Co., Maryland, USA
100.3km (62.3 miles) 7 Bare Hills Serpentine Quarry East, Bare Hills, Baltimore Co., Maryland, USA
100.3km (62.4 miles) 8 Anthophyllite Location, Bare Hills, Baltimore Co., Maryland, USA
100.4km (62.4 miles) 9 Unnamed Chromite prospects, Bare Hills, Baltimore Co., Maryland, USA
Mineral and/or Locality  
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