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Mahopac Mines (Hill Mine; German Flats Mine), German Flats, Putnam Co., New York, USA

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Ref.: The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 32 & 80; NY State Museum Bull. Nos. 249-250, Magnetic Iron Deposits of SE NY, Clarke, John M. (Sep-Oct 1921): 124-125; Rocks & Min.: 15:126. These mines are located just West of lake Mahopac on the road from US highway 6 to Kent Cliffs, near German Flats & about 1¾ miles North of Mahopac Falls.. The mine was abandoned in 1895 when the mining operation encountered a fault and the orebody was lost. The ore consisted of 4 beds 90 feet in breath overall and 10 to 15 feet (3.1 to 4.8 meters) wide each.





 Map Reference: 41°23'N , 73°45'W

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Mineral List:
  		•  Actinolite
    ☐Ca
     
    2
    		(Mg,Fe
    2+
     
    		)
     
    5
    		(Si
     
    8
    		O
     
    22
    		)(OH)
     
    2
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  'Amphibole Group'
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  'Apatite'
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  Calcite
    CaCO
     
    3
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  Chalcopyrite
    CuFeS
     
    2
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  'Chlorite Group'
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  Chondrodite
    (Mg,Fe
    2+
     
    		)
     
    5
    		[(F,OH)
     
    2
    		|(SiO
     
    4
    		)
     
    2
    		]
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80; NY State Museum Bull. Nos. 249-250, Magnetic Iron Deposits of SE NY, Clarke, John M. (Sep-Oct 1921): 125.]
  		•  'Chrysolite'
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  Chrysotile
    Mg
     
    3
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80; NY State Museum Bull. Nos. 249-250, Magnetic Iron Deposits of SE NY, Clarke, John M. (Sep-Oct 1921): 125..]
  		•  Clinochlore
    (Mg,Fe
    2+
     
    		)
     
    5
    		Al[(OH)
     
    8
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80; NY State Museum Bull. Nos. 249-250, Magnetic Iron Deposits of SE NY, Clarke, John M. (Sep-Oct 1921): 125..]
  		•  Clinohumite
    (Mg,Fe
    2+
     
    		)
     
    9
    		[(F,OH)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  Clinozoisite
    {Ca
     
    2
    		}{Al
     
    3
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: [NY State Museum spec. no. 19554]
  		•  Dolomite
    CaMg(CO
     
    3
    		)
     
    2
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  Epidote
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  'Hornblende'
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  Magnetite
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80;NY State Museum Bull. Nos. 249-250, Magnetic Iron Deposits of SE NY, Clarke, John M. (Sep-Oct 1921): 125. .]
  		•  'Mica Group'
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  'Olivine'
    (Mg,Fe
    2+
     
    		)
     
    2
    		[SiO
     
    4
    		]
    Reference: [Marian Lupulescu (2008) Rocks and Minerals, 83, #3.]
  		•  Phlogopite
    KMg
     
    3
    		[(OH,F)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80; NY State Museum Bull. Nos. 249-250, Magnetic Iron Deposits of SE NY, Clarke, John M. (Sep-Oct 1921): 125.]
  		•  Pyrite
    FeS
     
    2
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  'Pyroxene Group'
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  Pyrrhotite
    Fe
     
    7
    		S
     
    8
    		, (-4M), also given as Fe
     
    1-x
    		S (x = 0 - 0.2)
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  Quartz
    SiO
     
    2
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  'Scapolite'
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80; Rocks & Min.: 15:126.]
  		•  Spinel
    MgAl
     
    2
    		O
     
    4
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  Talc
    Mg
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  Titanite
    CaTi[O|SiO
     
    4
    		]
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]
  		•  'Tourmaline'
    Reference: [The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 80.]


    28 entries listed. 18 valid minerals.

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