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

Classification
Species:'Biotite' (not an IMA apprroved species)
Comments:"Rosettes" were reported to occur in lenses and bands of albite in gneiss
Large greenish black masses of this mica have been found exhibiting broad cleavage.
Habit:rosettes, cleavable masses
Colour:black, greenish-black
Confirmation
Validity:Believed Valid
References
References:The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 94.
Breidenbaugh, 1873; Nightingale 2001
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Tilly Foster Iron Mine, Brewster, Town of Southeast, Putnam Co., New York, USA
Nearest other occurrences of Biotite
4.6km (2.9 miles) A Interstate 84 road cuts, Brewster, Southeast Township, Putnam Co., New York, USA
7.4km (4.6 miles) B Mc Collum Mine (Croton Magnetic Iron-ore Mines), Brewster, Town of Southeast, Putnam Co., New York, USA
13.2km (8.2 miles) C Western Connecticut State College, Danbury, Fairfield Co., Connecticut, USA
16.2km (10.1 miles) D North Street mall, Danbury, Fairfield Co., Connecticut, USA
16.5km (10.2 miles) E Danbury, Fairfield Co., Connecticut, USA
19.6km (12.2 miles) F Ridgefield, Fairfield Co., Connecticut, USA
21.6km (13.4 miles) G U. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield Co., Connecticut, USA
22.2km (13.8 miles) H Shaft 7, Delaware Aqueduct, Fishkill Township, Dutchess Co., New York, USA
23.6km (14.7 miles) I Bedford, Westchester Co., New York, USA
23.6km (14.7 miles) J Baylis Quarry (Bayliss Quarry), Bedford, Westchester Co., New York, USA
24.4km (15.2 miles) K Kinkel Quarry, Bedford, Westchester Co., New York, USA
25.3km (15.7 miles) L Redding Glen (Redding Ridge), Redding (Reading), Fairfield Co., Connecticut, USA
25.9km (16.1 miles) M Biermann Quarries (Bethel quarries) and tourmaline ledge, Bethel, Fairfield Co., Connecticut, USA
25.9km (16.1 miles) N Mount Taurus quarry (Mt Taurus quarry; Bull Hill quarry; Verplanck quarry), Cold Spring, Town of Philipstown, Putnam Co., New York, USA
29.0km (18.0 miles) O Crugers Emery Mine, Montrose, Cortlandt Township, Westchester Co., New York, USA
29.4km (18.3 miles) P Philips Mine (Philips Pyrite Mine; Anthony's Nose Pyrrhotite Mine), Anthony's Nose, Philipstown Township, Putnam Co., New York, USA
30.0km (18.6 miles) Q Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange Co., New York, USA
30.6km (19.0 miles) R Green's Farm locality (Roxbury garnet mine; Roxbury Falls garnet mine; Garnet Hill), Roxbury, Litchfield Co., Connecticut, USA
31.1km (19.4 miles) S Rockside Quarry (Mine Hill Quarry), Mine Hill (Ore Hill), Roxbury, Litchfield Co., Connecticut, USA
32.6km (20.3 miles) T New Canaan, Fairfield Co., Connecticut, USA
33.1km (20.5 miles) U Kyanite locality (Judds Bridge locality), Washington, Litchfield Co., Connecticut, USA
34.3km (21.3 miles) V New England Materials quarry, Monroe, Fairfield Co., Connecticut, USA
34.9km (21.7 miles) W Beechy Bottom Mine, Bear Mountain State Park, Rockland Co., New York, USA
38.0km (23.6 miles) X Old Mine Park (Lane’s Mine of Trumbull; Lane's New Stratford mine; Hubbard Mine; Long Hill Mine; Old Tungsten Mine), Long Hill, Trumbull, Fairfield Co., Connecticut, USA
38.6km (24.0 miles) Y Norwalk, Fairfield Co., Connecticut, USA
39.3km (24.4 miles) Z Nonnewaug River Industrial Park, Woodbury, Litchfield Co., Connecticut, USA
39.4km (24.5 miles) 0 Valhalla, Mount Pleasant, Westchester Co., New York, USA
39.7km (24.7 miles) 1 Curtis Quarry (Southford Quarry; Southford pegmatite; Southbury rose quartz quarry; Bridgeport Woodfinishing Co. Quarry; Hulls Hill), Southford, Southbury, New Haven Co., Connecticut, USA
42.2km (26.2 miles) 2 Greenwood mine (Patterson mine), Town of Tuxedo, Orange Co., New York, USA
43.4km (27.0 miles) 3 Greenwich, Fairfield Co., Connecticut, USA
43.9km (27.3 miles) 4 Hogencamp Mine, Town of Tuxedo, Orange Co., New York, USA
44.9km (27.9 miles) 5 Greenwood Furnace, Arden (Greenwood), Orange Co., New York, USA
45.2km (28.1 miles) 6 Voorhis Quarry, Greenwich, Fairfield Co., Connecticut, USA
45.5km (28.3 miles) 7 VIllage of Monroe, Town of Monroe, Orange Co., New York, USA
46.9km (29.2 miles) 8 O'Neil Mine (Nail Mine), Lake Mombasha, Town of Monroe, Orange Co., New York, USA
47.2km (29.4 miles) 9 Clove Mine (Wilks Mine), Village of Monroe, Town of Monroe, Orange Co., New York, USA
Mineral and/or Locality  
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