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Magnetite from
Tilly Foster Iron Mine, Brewster, Town of Southeast, Putnam Co., New York, USA

Classification
Species:Magnetite
Comments:Tilly Foster is noted for superb dodecahedral and striated octahedral crystal groups, with individual crystals up to 3 cm. Octahedrons were typically found in seams in gneiss, while dodecahedrons were more commonly found within the magnetite ore body. Dendritic forms on serpentine have also been reported
Large masses of this species have been found exhibiting perfect octahedral parting.
Habit:dodecahedral, octahedral, dendritic
Colour:black
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Extremely common
Confirmation
Validity:Believed Valid
References
References:(Dana, 1874) (Januzzi, 1966, 1989) (Man¬chester, 1931) (Trainer, 1938, 1941) (Whitlock, 1903) (Nightingale 2001)
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 214..
Associated Minerals:
Associates:Dolomite
Associated Minerals Based on Photo Data:
Chondrodite23 photos of Magnetite associated with Chondrodite at this locality.
Clinochlore17 photos of Magnetite associated with Clinochlore at this locality.
Lizardite3 photos of Magnetite associated with Lizardite at this locality.
Brucite2 photos of Magnetite associated with Brucite at this locality.
Dolomite2 photos of Magnetite associated with Dolomite at this locality.
Actinolite2 photos of Magnetite associated with Actinolite at this locality.
Hornblende2 photos of Magnetite associated with Hornblende at this locality.
Muscovite1 photo of Magnetite associated with Muscovite at this locality.
Data
Mineral Data:Click here to view Magnetite data
Locality Data:Click here to view Tilly Foster Iron Mine, Brewster, Town of Southeast, Putnam Co., New York, USA
Nearest other occurrences of Magnetite
3.4km (2.1 miles) A Brewster Mines (Cheever Mine; Durant Mine), Brewster, Town of Southeast, Putnam Co., New York, USA
4.6km (2.9 miles) B Interstate 84 road cuts, Brewster, Southeast Township, Putnam Co., New York, USA
7.4km (4.6 miles) C Mc Collum Mine (Croton Magnetic Iron-ore Mines), Brewster, Town of Southeast, Putnam Co., New York, USA
7.8km (4.9 miles) D Theall Mine (Croton Magnetic Iron-ore Mines), Brewster, Town of Southeast, Putnam Co., New York, USA
9.1km (5.7 miles) E Mahopac Mines (Hill Mine; German Flats Mine), Carmel, Putnam Co., New York, USA
9.3km (5.8 miles) F Clover Hill Mine, Croton Falls, Somers Township, Westchester Co., New York, USA
13.2km (8.2 miles) G Western Connecticut State College, Danbury, Fairfield Co., Connecticut, USA
16.7km (10.4 miles) H Denny Magnetite Mine (Denny Mine), Putnam Valley Township, Putnam Co., New York, USA
16.7km (10.4 miles) I Pratt Mine, Putnam Valley Township, Putnam Co., New York, USA
16.7km (10.4 miles) J Hamilton Mine (Sackett Mine), Canada Mines Group, Canopus Lake, Putnam Valley Township, Putnam Co., New York, USA
16.7km (10.4 miles) K Stewart Mine (Sunk Mine), Canada Mines Group, Canopus Lake, Town of Putnam Valley, Putnam Co., New York, USA
16.7km (10.4 miles) L Canada Mine, Canada Mines Group, Town of Putnam Valley, Putnam Co., New York, USA
18.9km (11.7 miles) M Yorktown, Westchester Co., New York, USA
19.6km (12.2 miles) N Croft Mine, Oscawana Corners, Town of Putnam Valley, Putnam Co., New York, USA
19.6km (12.2 miles) O Ridgefield, Fairfield Co., Connecticut, USA
20.8km (12.9 miles) P Phillips ore bed, Town of Putnam Valley, Putnam Co., New York, USA
21.0km (13.0 miles) Q Canopus Mine (Nelson Mine), Travis Corners, Town of Philipstown, Putnam Co., New York, USA
21.6km (13.4 miles) R U. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield Co., Connecticut, USA
23.6km (14.7 miles) S Bedford, Westchester Co., New York, USA
23.8km (14.8 miles) T Todd Mine, Peekskill, Westchester Co., New York, USA
24.1km (15.0 miles) U Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield Co., Connecticut, USA
24.2km (15.0 miles) V Strang Emery Pit, Toddville, Cortlandt Township, Westchester Co., New York, USA
25.4km (15.8 miles) W Constitution Island, Hudson River, Town of Philipstown, Putnam Co., New York, USA
25.5km (15.8 miles) X Ilmenite locality, Bridgewater, Litchfield Co., Connecticut, USA
25.6km (15.9 miles) Y Redding (Reading), Fairfield Co., Connecticut, USA
25.7km (16.0 miles) Z West Point, Orange Co., New York, USA
26.4km (16.4 miles) 0 DiRubbo Emery Quarry, Cortlandt Township, Westchester Co., New York, USA
26.6km (16.6 miles) 1 Peekskill, Westchester Co., New York, USA
26.6km (16.6 miles) 2 De Luca Mine (McCoy Mine), Peekskill, Westchester Co., New York, USA
26.7km (16.6 miles) 3 September Mine, Peekskill, Westchester Co., New York, USA
29.0km (18.0 miles) 4 Crugers Emery Mine, Montrose, Cortlandt Township, Westchester Co., New York, USA
29.4km (18.3 miles) 5 Philips Mine (Philips Pyrite Mine; Anthony's Nose Pyrrhotite Mine), Anthony's Nose, Philipstown Township, Putnam Co., New York, USA
29.4km (18.3 miles) 6 Anthony's Nose, Peekskill, Westchester Co., New York, USA
29.6km (18.4 miles) 7 Ore loading dock, Fort Montgomery, Orange Co., New York, USA
30.0km (18.6 miles) 8 Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange Co., New York, USA
30.6km (19.0 miles) 9 Green's Farm locality (Roxbury garnet mine; Roxbury Falls garnet mine; Garnet Hill), Roxbury, Litchfield Co., Connecticut, USA
Mineral and/or Locality  
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