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

Classification
Species:Opal
Comments:Occurs as small grayish white coating on various minerals
Habit:coatings
Colour:grayish-white
Quality for species:Poor for species, only of interest for locality collectors. (#)
Confirmation
Validity:Believed Valid
References
References:Jensen (1978) Minerals of New York State, 42-43
(Januzzi, 1966, 1989) (Trainer, 1938).
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Tilly Foster Iron Mine, Brewster, Town of Southeast, Putnam Co., New York, USA
Nearest other occurrences of Opal
4.6km (2.9 miles) A Interstate 84 road cuts, Brewster, Southeast Township, Putnam Co., New York, USA
13.2km (8.2 miles) B Western Connecticut State College, Danbury, Fairfield Co., Connecticut, USA
17.7km (11.0 miles) C Casey Quarry (Ridgefield pegmatite), Ridgefield, Fairfield Co., Connecticut, USA
19.6km (12.2 miles) D Ridgefield, Fairfield Co., Connecticut, USA
20.8km (12.9 miles) E Phillips ore bed, Town of Putnam Valley, Putnam Co., New York, USA
21.6km (13.4 miles) F U. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield Co., Connecticut, USA
23.6km (14.7 miles) G Baylis Quarry (Bayliss Quarry), Bedford, Westchester Co., New York, USA
23.6km (14.7 miles) H Bedford, Westchester Co., New York, USA
24.1km (15.0 miles) I Consolidated Feldspar Mining Corporation's plant (Baylis prospect (property) & Speranza prospect (property)), Bedford, Westchester Co., New York, USA
24.1km (15.0 miles) J Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield Co., Connecticut, USA
24.2km (15.0 miles) K Strang Emery Pit, Toddville, Cortlandt Township, Westchester Co., New York, USA
25.9km (16.1 miles) L Biermann Quarries (Bethel quarries) and tourmaline ledge, Bethel, Fairfield Co., Connecticut, USA
27.6km (17.1 miles) M McCoy's Gold Mine, Camp Smith, Peekskill, Westchester Co., New York, USA
29.0km (18.0 miles) N Crugers Emery Mine, Montrose, Cortlandt Township, Westchester Co., New York, USA
29.4km (18.3 miles) O Philips Mine (Philips Pyrite Mine; Anthony's Nose Pyrrhotite Mine), Anthony's Nose, Philipstown Township, Putnam Co., New York, USA
30.8km (19.2 miles) P Roxbury Iron Mine (Shepaug Iron Company Mine; Shepaug Spathic Iron and Steel Company Mine), Mine Hill (Ore Hill), Roxbury, Litchfield Co., Connecticut, USA
32.1km (19.9 miles) Q New England Mining Company Quarry (Roebling Mine; Hewitt's Mine), Upper Merryall, New Milford, Litchfield Co., Connecticut, USA
36.9km (22.9 miles) R Southbury, New Haven Co., Connecticut, USA
37.6km (23.4 miles) S Old Mine Plaza construction site, Long Hill, Trumbull, Fairfield Co., Connecticut, USA
38.0km (23.6 miles) T 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
39.3km (24.4 miles) U Nonnewaug River Industrial Park, Woodbury, Litchfield Co., Connecticut, USA
39.7km (24.7 miles) V Curtis Quarry (Southford Quarry; Southford pegmatite; Southbury rose quartz quarry; Bridgeport Woodfinishing Co. Quarry; Hulls Hill), Southford, Southbury, New Haven Co., Connecticut, USA
43.6km (27.1 miles) W White Plains, Westchester Co., New York, USA
50.3km (31.3 miles) X Lake Street Quarry, Harrison, Westchester Co., New York, USA
53.9km (33.5 miles) Y Blue Stone Quarry, Waterbury, New Haven Co., Connecticut, USA
57.6km (35.8 miles) Z Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield Co., Connecticut, USA
58.4km (36.3 miles) 0 State Route 8 and State Route 118 interchange, Harwinton, Litchfield Co., Connecticut, USA
59.8km (37.2 miles) 1 Lead Mine Brook, Harwinton, Litchfield Co., Connecticut, USA
65.3km (40.6 miles) 2 Torringford, Torrington, Litchfield Co., Connecticut, USA
67.6km (42.0 miles) 3 Rhein property, Amity, Town of Warwick, Orange Co., New York, USA
74.2km (46.1 miles) 4 Upper New Street Quarry (Burger's Quarry), Paterson, Passaic Co., New Jersey, USA
76.5km (47.5 miles) 5 Francisco Brothers Quarry (Francisco Quarry), Great Notch, Little Falls Township, Passaic Co., New Jersey, USA
78.5km (48.8 miles) 6 New York - West Shore & Buffalo RR tunnel, Weehawken, Bergen Hill, Hudson Co., New Jersey, USA
79.5km (49.4 miles) 7 McDowell's Quarry (Osborne and Marsellis Quarry), Upper Montclair, Montclair Township, Essex Co., New Jersey, USA
81.1km (50.4 miles) 8 Durham, Middlesex Co., Connecticut, USA
82.7km (51.4 miles) 9 F.J. Marley Quarry, Verona Township, Essex Co., New Jersey, USA
Mineral and/or Locality  
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