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Great Hill cobalt mines, East Hampton, Middlesex Co., Connecticut, USA

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Old cobalt mines, now in a state forest, first worked ca. 1762 under the direction of Dr. Stephaunes of Germany.



References:
- Barber, J. W. (1836) Connecticut Historical Collections, p.520.
- American Mineralogist 6 (1921) 88-90.





Mineral List:
  		•  Actinolite
    ☐Ca
     
    2
    		(Mg,Fe
    2+
     
    		)
     
    5
    		(Si
     
    8
    		O
     
    22
    		)(OH)
     
    2
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Almandine
    Fe
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Annabergite
    Ni
     
    3
    		(AsO
     
    4
    		)
     
    2
    		·8H
     
    2
    		O
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Apatite-(CaF)
    Ca
     
    5
    		[F|(PO
     
    4
    		)
     
    3
    		]
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Arsenolite
    As
     
    2
    		O
     
    3
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Arsenopyrite
    FeAsS - (Fe
     
    0.90
    		Co
     
    0.10
    		)AsS
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Arsenopyrite
    var: Danaite
    (Fe
     
    0.90
    		Co
     
    0.10
    		)AsS - (Fe
     
    0.65
    		Co
     
    0.35
    		)AsS
    Reference: [AmMin 6:88-90 (1921)]
  		•  Biotite
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Breithauptite
    NiSb
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Chalcopyrite
    CuFeS
     
    2
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  'Chlorite Group'
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Cobaltite
    CoAsS
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Cordierite
    (Mg,Fe)
     
    2
    		Al
     
    4
    		Si
     
    5
    		O
     
    18
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Diopside
    CaMg[Si
     
    2
    		O
     
    6
    		]
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Erythrite
    Co
     
    3
    		(AsO
     
    4
    		)
     
    2
    		·8H
     
    2
    		O
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Gahnite
    ZnAl
     
    2
    		O
     
    4
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Galena
    PbS
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Gersdorffite
    NiAsS
    Reference: [Januzzi, 1976. Mineral Localities of CT and Southeastern NY State]
  		•  Goethite
    α-Fe
    3+
     
    		O(OH)
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Gold ?
    Au
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Grossular
    Ca
     
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  'Hornblende'
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Kaolinite
    Al
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Limonite
    FeO(OH)·nH
     
    2
    		O
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Melanterite
    FeSO
     
    4
    		·7H
     
    2
    		O
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Microcline
    K[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Muscovite
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Nickeline
    NiAs
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Nickelskutterudite
    var: Chloanthite ?
    NiAs
     
    2
    		 - excess As up to As
     
    2.5
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Opal
    SiO
     
    2
    		·nH
     
    2
    		O
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Opal
    var: Opal-AN
    SiO
     
    2
    		·nH
     
    2
    		O
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Orthoclase
    K[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Pickeringite
    MgAl
     
    2
    		(SO
     
    4
    		)
     
    4
    		·22H
     
    2
    		O
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Pitticite ?
    [Fe, SO
     
    4
    		, AsO
     
    4
    		, H
     
    2
    		O] ?
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Pyrite
    FeS
     
    2
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Pyrolusite
    MnO
     
    2
    Description: A black earthy mineral which has yet to be properly identified.
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Pyrrhotite
    Fe
     
    7
    		S
     
    8
    		, (-4M), also given as Fe
     
    1-x
    		S (x = 0 - 0.2)
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Quartz
    SiO
     
    2
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Schorl
    [Na][Fe
    2+
    3
    		][Al
     
    6
    		][(OH)
     
    3
    		|OH|(BO
     
    3
    		)
     
    3
    		|Si
     
    6
    		O
     
    18
    		]
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Scorodite
    Fe
    3+
     
    		AsO
     
    4
    		·2H
     
    2
    		O
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  'Sericite'
    Reference: [AmMin 6:88-90 (1921)]
  		•  Siderite
    FeCO
     
    3
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Sillimanite
    Al
     
    2
    		[O|SiO
     
    4
    		]
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Skutterudite
    (Co,Fe,Ni)As
     
    2-3
    Reference: [Januzzi, 1976. Mineral Localities of CT and Southeastern NY State]
  		•  Skutterudite
    var: Smaltite
    (Co,Fe,Ni)As
     
    2
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Sphalerite
    (Zn,Fe
    2+
     
    		)S
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  Staurolite
    (Fe
    2+
     
    		,Mg,Zn)
     
    1.5-2
    		Al
     
    9
    		[O
     
    6
    		|(OH,O)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
    Reference: [Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State]
  		•  'Voltzite' ?
    Reference: [Januzzi, 1976. Mineral Localities of CT and Southeastern NY State]


    49 entries listed. 37 valid minerals. 1 erroneous literature entry.

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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in Connecticut, USA Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 29th Nov 2009 15:28:04