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

Locality type:Mine
Classification
Species:Magnetite
Formula:Fe2+Fe23+O4
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
Photo GalleryView Gallery (15 photos)
Nearest other occurrences of Magnetite
2.7km (1.7 miles) Brewster Mines (Cheever Mine; Durant Mine), Brewster, Town of Southeast, Putnam Co., New York, USA
3.9km (2.4 miles) Interstate 84 road cuts, Brewster, Southeast Township, Putnam Co., New York, USA
7.0km (4.4 miles) Mc Collum Mine (Croton Magnetic Iron-ore Mines), Brewster, Town of Southeast, Putnam Co., New York, USA
7.1km (4.4 miles) Theall Mine (Croton Magnetic Iron-ore Mines), Brewster, Town of Southeast, Putnam Co., New York, USA
9.1km (5.6 miles) Clover Hill Mine, Croton Falls, Somers Township, Westchester Co., New York, USA
9.6km (6.0 miles) Mahopac Mines (Hill Mine; German Flats Mine), Carmel, Putnam Co., New York, USA
12.5km (7.7 miles) Western Connecticut State College, Danbury, Fairfield County, Connecticut, USA
15.5km (9.6 miles) North Street mall, Danbury, Fairfield County, Connecticut, USA
17.3km (10.8 miles) Denny Magnetite Mine (Denny Mine), Putnam Valley Township, Putnam Co., New York, USA
17.3km (10.8 miles) Pratt Mine, Putnam Valley Township, Putnam Co., New York, USA
 
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