Locality type: Mine Classification Species: Magnetite Formula: Fe2+ Fe2 3+ 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 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 Associated Minerals: Associates: Dolomite Associated Minerals Based on Photo Data: Chondrodite 108 Clinochlore 77 Calcite 22 Lizardite 21 Antigorite 16 Dolomite 10 Serpentine Subgroup 10 - var Picrolite 1 - var Marmolite 1 Hydromagnesite 9 Actinolite 8 Brucite 5 Malachite 5 Muscovite 5 Limonite 4 Tremolite 4 Talc 3 Phlogopite 3 Pyrrhotite 3 Chrysotile 2 Gypsum 2 Fluorite 2 Amphibole Supergroup 2 Diopside 2 Hornblende Root Name Group 2 Grossular 1 Axinite-(Fe) 1 Rutile 1 Riebeckite 1 Chalcopyrite 1 Titanite 1 Data Mineral Data: Click here to view Magnetite data Locality Data: Click here to view Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA Photo Gallery View Gallery (53 photos) Data Identifiers Mindat Occurrence Record ID: 44749 Long-form Identifier: 1:3:44749:6 GUID (UUID V4 ): 0 Nearest other occurrences of Magnetite
1.9km (1.2 miles) ⓘ Interstate 84 road cuts, Town of Southeast, Putnam County, New York, USA 2.7km (1.7 miles) ⓘ Brewster Mines, Brewster, Town of Southeast, Putnam County, New York, USA 7.0km (4.4 miles) ⓘ Mc Collum Mine, North Salem, Westchester County, New York, USA 7.1km (4.4 miles) ⓘ Theall Mine, Town of Southeast, Putnam County, New York, USA 9.1km (5.6 miles) ⓘ Clover Hill Mine, Croton Falls, Somers Township, Westchester County, New York, USA 10.1km (6.2 miles) ⓘ Mahopac Mines, Town of Carmel, Putnam County, New York, USA 12.5km (7.7 miles) ⓘ Western Connecticut State University, 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, Town of Putnam Valley, Putnam County, New York, USA 17.3km (10.8 miles) ⓘ Pratt Mine, Canada Mines Group (Canada Iron Mines), Town of Putnam Valley, Putnam County, New York, USA References Palache, Charles; Berman, Harry; Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons. Search for references including Magnetite Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA