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Walden Gem Quarry (Gotta-Walden prospect), Portland, Middlesex Co., Connecticut, USA

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Granite pegmatite.

Seaman, David. (1970): The Paragenesis of The Walden Pegmatite, Portland, Conn. (Rocks & Minerals 45:443-449, 523-529).





Mineral List:
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [No reference listed]
  		•  Albite
    var: Cleavelandite
    Reference: [No reference listed]
  		•  'Allanite'
    Reference: [Rocks & Min.: 70:402]
  		•  Almandine
    Fe
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
    Reference: [No reference listed]
  		•  Apatite-(CaF)
    Ca
     
    5
    		[F|(PO
     
    4
    		)
     
    3
    		]
    Reference: [No reference listed]
  		•  Apatite-(CaF)
    var: Mn-bearing Apatite-(CaF)
    (Ca,Mn
    2+
     
    		)
     
    5
    		(PO
     
    4
    		)
     
    3
    		(F,Cl,OH) or Ca
     
    5
    		([P,Mn
    3+
     
    		]O
     
    4
    		)
     
    3
    		(F,Cl,OH)
    Reference: [Michael W. Kieron collection]
  		•  Autunite
    Ca(UO
     
    2
    		)
     
    2
    		(PO
     
    4
    		)
     
    2
    		·11H
     
    2
    		O
    Reference: []
  		•  Beryl
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
    Reference: [No reference listed]
  		•  Beryl
    var: Aquamarine
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
    Reference: []
    Site Photo
    Walden Gem Quarry (Gotta-Walden prospect), Portland, Middlesex Co., Connecticut, USA
    © 2003 John H. Betts
  		•  Elbaite
    [Na][(Li,Al)
     
    3
    		][Al
     
    6
    		][(OH)
     
    3
    		|OH|(BO
     
    3
    		)
     
    3
    		|Si
     
    6
    		O
     
    18
    		]
    Reference: [No reference listed]
  		•  Lepidolite
    Reference: [No reference listed]
    Site Photo
    Walden Gem Quarry (Gotta-Walden prospect), Portland, Middlesex Co., Connecticut, USA
    © 2005 Peter Cristofono
  		•  Manganite
    Mn
    3+
     
    		O(OH)
    Description: No data.
    Reference: [Seaman, 1976. Pegmatite Minerals of the World]
  		•  Microcline
    K[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [No reference listed]
  		•  Microlite
    (Ca,Na)
     
    2
    		Ta
     
    2
    		O
     
    6
    		(O,OH,F)
    Reference: [Rocks & Min.: 70:403]
    Site Photo
    Walden Gem Quarry (Gotta-Walden prospect), Portland, Middlesex Co., Connecticut, USA
    © 2005 Peter Cristofono
  		•  Montebrasite
    LiAl[(OH,F)|PO
     
    4
    		]
    Reference: [Rocks & Min.: 70:403]
  		•  Muscovite
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [No reference listed]
  		•  Pollucite
    (Cs,Na)
     
    2
    		[Al
     
    2
    		Si
     
    4
    		O
     
    12
    		] · 2H
     
    2
    		O
    Reference: [Rocks & Min.: 70:382]
    Site Photo
    Walden Gem Quarry (Gotta-Walden prospect), Portland, Middlesex Co., Connecticut, USA
    © 2009 Kevin M. Czaja
  		•  Pyrolusite
    MnO
     
    2
    Description: No pyrolusite dendrite or staining in a granite pegmatite in the world has been verified as pyrolusite. The name was a mistake in the nineteenth century which has been widely publicized.
    Reference: [Seaman, 1976. Pegmatite Minerals of the World]
  		•  Schorl
    [Na][Fe
    2+
    3
    		][Al
     
    6
    		][(OH)
     
    3
    		|OH|(BO
     
    3
    		)
     
    3
    		|Si
     
    6
    		O
     
    18
    		]
    Reference: [No reference listed]
  		•  Spodumene
    LiAl[Si
     
    2
    		O
     
    6
    		]
    Reference: [No reference listed]
  		•  Spodumene
    var: Kunzite
    Reference: [Rocks & Min.: 70:382]
  		•  Sulphur
    S
     
    8
    Reference: [Rocks & Min.: 70:403]
    Site Photo
    Walden Gem Quarry (Gotta-Walden prospect), Portland, Middlesex Co., Connecticut, USA
    © 2009 Kevin M. Czaja
  		•  Tantalite-(Mn)
    MnTa
     
    2
    		O
     
    6
    Reference: [Self collected by Kevin Czaja]
    Site Photo
    Walden Gem Quarry (Gotta-Walden prospect), Portland, Middlesex Co., Connecticut, USA
    © 2009 Kevin M. Czaja
  		•  'Tourmaline
    var: Rubellite'
    Reference: [Seaman, 1976. Pegmatite Minerals of the World]
  		•  Zircon
    Zr[SiO
     
    4
    		]
    Reference: [Seaman, 1976. Pegmatite Minerals of the World]


    25 entries listed. 16 valid minerals. 2 erroneous literature entries.

    The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database!
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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 21:41:24