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

Locality type:Mine
Formula:Mg5(CO3)4(OH)2 · 4H2O
Comments:J. D. Dana described a white chalky coating on serpentine
Habit:chalky coating
References:Jensen (1978) Minerals of New York State, 42-43
Dana, 1874
Associated Minerals Based on Photo Data:
Pyrrhotite1 photo of Hydromagnesite associated with Pyrrhotite at this locality.
Mineral Data:Click here to view Hydromagnesite data
Locality Data:Click here to view Tilly Foster Iron Mine, Brewster, Town of Southeast, Putnam Co., New York, USA
Nearest other occurrences of Hydromagnesite
81.0km (50.3 miles) A Castle Point, Hoboken, Hudson Co., New Jersey, USA
98.1km (61.0 miles) B Spring Street Artinite occurrence, Staten Island (Richmond Co.), New York City, New York, USA
99.8km (62.0 miles) C Victory Diner locality, Staten Island (Richmond Co.), New York City, New York, USA
150.8km (93.7 miles) D Sherrer Quarry (C.K. Williams & Co. Quarry; Williams Quarry), C.K. Williams Quarry complex (Williams and Company Rock Quarry), Chestnut Hill (College Hill; Lafayette Hill; Mount Lafayette; Paxinosa Ridge), Easton, Northampton Co., Pennsylvania, USA
230.3km (143.1 miles) E Brinton's Quarry, West Chester, Westtown Township, Chester Co., Pennsylvania, USA
Mineral and/or Locality  
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